Yes. A 12-week plan at 5-8 hours per week gets a rider who can already do 40-50 miles to century fitness: one long ride each weekend building to 80-85 miles, plus 2-3 focused weekday sessions, ideally indoors.
Yes — here is the math
A century is an endurance event, and endurance responds to weekly volume concentrated in one long ride. Working full time costs you midweek hours, not weekend ones — so the weekend ride carries the plan while weekdays deliver fitness density.
If you can currently ride 40-50 miles, 12 weeks is enough. From a lower base, start at 16 weeks with four base weeks first.
12-week compressed plan
| Phase | Weeks | Key weekend ride | Weekly hours |
|---|---|---|---|
| Base | 1-4 | 50 → 65 miles | 5-6 |
| Build | 5-8 | 70 → 80 miles | 6-7 |
| Peak | 9-10 | 85 miles (longest) | 7-8 |
| Taper | 11-12 | 55 → event day | 4-5 |
One long ride per week carries the plan
Protect the weekend long ride above everything else. If you must miss a weekday session, fine; miss two long rides in a row and the plan resets a phase.
Build the long ride by roughly 10% per week with an easier week every third week. Ride it at conversational Zone 2 pace — finishing feeling fresh is the target, not speed.
Weekday sessions on the indoor trainer
The trainer turns a 2-hour outdoor loop into a focused 60-minute session with zero drive time. That is how a working rider finds 4 weekday hours.
Two quality sessions plus one easy spin is enough midweek.
Practice nutrition on every long ride
- Target 30-60 g of carbohydrate per hour from the first hour, not when you feel flat.
- One bottle per hour minimum; add electrolytes beyond 90 minutes.
- Test race-day bars, gels, and drinks during build weeks — never try anything new on event day.
- Practice eating while riding on every long ride; stopping for lunch is not the skill.
Taper and event week
Cut volume by 40-50% in the final two weeks while keeping a touch of intensity — short sweet spot efforts keep the legs sharp without adding fatigue. The longest ride is done three weeks out, not the weekend before.
Event day pacing: settle into Zone 2 for the first half, eat from hour one, and leave the tempo surges for the last 20 miles if the legs are there.
Using Vo2Max
Add your century as a target event in Vo2Max and the generator back-plans the long rides, recovery weeks, and taper to fit the hours you actually have free.