Really, if you're only increasing rides by 5 miles at a time, then suddenly going up by 40 miles is huge. That's an extra 2-3 hours of riding, maybe more. It is a mental challenge as well as a physical challenge.
My longest training rides for centuries were 80-90 miles.
- Gray 2010 carbon WSD road bike, Rivet Independence saddle
- Red hardtail 26" aluminum mountain bike, Bontrager Evoke WSD saddle
- Royal blue 2018 aluminum gravel bike, Rivet Pearl saddle
Gone but not forgotten:
- Silver 2003 aluminum road bike
- Two awesome worn out Juliana saddles