Iron distance training hours

A 3.8 km swim, 180 km ride and a marathon. Here are the weekly training hours from now to race day.

Your details

Training to race day

326 hours

over 30 weeks, finishing in about 12 h 22 min

Swim 3.8 km1:22:20
Bike 180.2 km6:26:09
Run 42.2 km4:23:45
Transitionsabout 10 min
Plan shapesteady build with an easier week every fourth, then a 2 week taper

Training hours this high take a toll on sleep, family and work, so plan rest as carefully as sessions. Race day pace is usually slower than training pace for the run.

Get a check with your GP before starting if you have a heart condition, chest pain on exertion or a family history of sudden heart problems.

The working

30 weeks, building from 8 to 16 hours a week

A steady build with an easier week every fourth and a 2 week taper comes to 326 hours. At 2:10 per 100 m, 28 km/h and 6:15 per km, race day is about 1:22 swimming, 6:26 riding and 4:24 running: roughly 12 h 22 min with transitions.

Making room

Life still happens

Long sessions at weekends, short ones in the week
Commute by bike when you can
Plan rest weeks with your family calendar
Sleep is part of training

Before you start

Health first

If you have a heart condition, chest pain on exertion or any doubt, talk to your GP before a big endurance goal. Build slowly: most injuries come from doing too much too soon.

Read with care

What this cannot tell you

Write your planA coach or club can help.
Predict race dayHeat, wind and hills change times.
Count recoveryRest days matter as much.

Questions

Common questions

How many hours does iron distance training take?

Often 8 to 18 hours a week over 6 to 9 months.

How long is an iron distance race?

3.8 km swim, 180 km bike and 42.2 km run.

What is a good first finish time?

Many first timers finish in 12 to 15 hours; the cut off is usually 16 to 17.

Can a beginner do one?

With a year or more of steady build up, many people do.

Sources

Last checked 21 October 2026. Spotted something wrong? Tell us and we will fix it.

Stop and get help

Stop and get help if you have chest pain, feel faint or are unusually breathless, and call 999 if chest pain does not go away. Check with your GP before stepping up if you have a heart, lung or joint condition.