How to Train for the London Marathon With a Job: Plan
The London Marathon ballot email lands, you scream, you tell everyone — and then the reality hits: you work full-time, you have 16–20 weeks to prepare, and you currently run parkrun “sometimes.” Training for 26.2 miles around a job is absolutely doable — thousands of busy Londoners do it every year — but it demands a smarter plan than the generic schedules assume. Here is how to get to the start line on Tower Bridge fit, healthy and still employed.
Pick the right plan for a working life
Forget the 6-day-a-week elite schedules. For runners with jobs, the sweet spot is 4–5 runs a week: two midweek sessions (one speed or tempo, one easy), a weekend long run, and one or two easy recovery runs. Total weekly time: 5–7 hours at peak. That is findable — it is two fewer Netflix evenings and a reclaimed lunch break.
Choose a beginner plan targeting 4:30–5:30 finish times unless you have serious running history. Hal Higdon’s Novice plans and the official TCS London Marathon training plans are built for real life, with rest days that are sacred, not optional. Start 18–20 weeks out if you can run 10k comfortably; 24 weeks if you are closer to couch than 10k. Our guide to starting running as a complete beginner over 40 is the right on-ramp if the marathon plan’s week one looks terrifying.
Where the hours actually come from
The maths of marathon training with a job: midweek runs must fit around work, so they become morning or lunch runs. Morning vs evening training has a clear winner for marathoners — mornings, because evenings get eaten by work, social plans and fatigue. A 6:30am run happens; a 7pm run after a brutal day is a negotiation.
Lunch runs are the secret weapon: 45 minutes at lunch twice a week covers your midweek easy mileage without touching evenings. Shower at work or run home — many Londoners build their whole training around the commute run. The long run owns one weekend morning: protect it like a work meeting, because 3-hour runs do not reschedule themselves.
The long run: your weekly non-negotiable
Everything in marathon training serves the long run. Build it gradually: start at 10–12 miles if you have a base, adding roughly a mile a week with a cutback week every third or fourth week. Peak at 20–22 miles three weeks before race day, then taper. The long run teaches your body to burn fat efficiently, hardens your legs, and — crucially — teaches you fuelling.
Practise everything on long runs: the shoes, the gels (one every 30–45 minutes after the first hour), the hydration, the anti-chafe strategy. Race day is never the time to try something new. London’s long-run routes are world-class training grounds: the Thames Path, Richmond Park’s loop, Regent’s Canal, or the marathon route itself for psychological familiarity.
Fuelling a working runner
Marathon training on a job means eating like it is your second job. You will burn an extra 2,500–4,000 calories a week at peak — undereating is the number one reason busy runners get injured or ill. Eat carbohydrates around training (porridge before morning runs, proper meals after), protein at every meal for recovery (1.6g per kilo daily), and do not fear the long-run refuel: a big Sunday roast after 20 miles is sports nutrition, culturally speaking.
Hydration matters more than most realise: carry water on runs over 75 minutes, practise with the electrolyte drinks offered on the London course, and learn your sweat rate in training. The NHS guidance on hydration and exercise covers the basics, but long-run experimentation teaches what works for your body.
Injury prevention for the time-poor
Busy runners get injured when they add mileage without adding maintenance. The minimum effective dose: 15 minutes of strength work twice a week (single-leg squats, calf raises, glute bridges, planks) and 5 minutes of mobility after runs. That is it — 40 minutes a week that prevents the IT band, Achilles and shin issues that end marathon campaigns.
Respect the warning signs: pain that changes your gait, pain that worsens during a run, or pain persisting beyond 48 hours all mean stop and assess. One week off in February saves a DNS (did not start) in April. Most London marathon dropouts are injured in weeks 8–14 — the danger zone where fitness rises faster than tissue tolerance. Patience there is everything.
The mental game and the taper
The hardest part of marathon training with a job is not physical — it is the February grind: dark, cold, 18-mile Sundays while colleagues brunch. Tactics that work: train with a club or group (London has dozens of marathon-focused groups), break the plan into 4-week blocks, and remember that every session is a deposit. Visualise the finish on The Mall when mile 17 feels endless.
The taper (final 2–3 weeks) is psychologically brutal: reduced mileage makes runners feel sluggish and paranoid. Trust it — fitness is banked, and freshness wins on the day. Sleep 8+ hours in race week, eat normally (the carbo-load is somewhat mythologised; just eat well), and lay out everything the night before.
Race week logistics for workers
Take the Friday before off if you can — expo visit, number collection and rest without work stress. Plan your race-morning transport obsessively (trains to the start are part of the experience; leave absurdly early). Tell your manager you will be useless on Monday — you will be, gloriously — and book it off now. Our overview of weekly exercise needs puts the whole endeavour in perspective: you are about to do in one day what the guidelines suggest for a month.
One final working-life tip: tell colleagues what you are doing early. The accountability of a hundred “how’s training going?” questions is surprisingly powerful in February, and the sponsorship haul for your charity place tends to grow with the audience. Most London Marathon places are charity-linked — embrace the fundraising as part of the journey, not an admin burden, and your colleagues become your support crew.
Conclusion
Training for the London Marathon with a job works on 4–5 runs a week: morning or lunch sessions midweek, one protected long run at the weekend, minimal but consistent strength work, and fuelling to match. Start 18–24 weeks out, respect the taper, and remember that thousands of busy Londoners cross that finish line every April — there is no reason you cannot be one of them.
Frequently Asked Questions
How many hours a week does marathon training take?
For a 4–5 run beginner plan, 5–7 hours at peak weeks, less early on. Midweek runs of 45–75 minutes plus one long run of 2–3.5 hours is the typical shape.
Can I train for a marathon running only 4 days a week?
Yes — many successful first-timers use 4-day plans. The long run matters far more than total days; consistency over 18–20 weeks beats heroic individual weeks.
When should I start training for the London Marathon?
18–20 weeks before race day if you can run 10k; 24 weeks if starting from lower fitness. The April race means starting in November–December — embrace winter training.
What should I eat while marathon training?
More than you think: an extra 2,500–4,000 calories weekly at peak. Prioritise carbs around runs, protein at every meal (1.6g/kg daily), and practise race-day fuelling (gels every 30–45 minutes) on every long run.