I ride year round, but not always on structure. Aug-Sept-Oct-Nov are for enjoying the nice weather and great bike rides. I’ve down-prioritized racing but used structured training for 8-9 months in order to be fit and quick for the fun rides.
Also lift weights year round. During structured bike training, I cut out the leg work but continue the upper body routine 2-3x per week. Then fall / winter add back in leg days. Will also do some pieces on the C2 rower in winter just to mix it up.
In total it works out to about 8 months a year of “serious” bike training with structure. Average about 10-12 hours a week of workout time.
Probably old-school, but am a fan of having a long period 3-4 months which is fun and less structured on the bike. I’ve done many all in race seasons, made it to 4.25 w/kg, etc. Nowadays more interested in really enjoying a great workout, great rides, keeping up strength with weights, etc.
FWIW… If I was still all in on race season, I would still use the Aug-Nov time period to ease back on structure and just get a ton of time in the Z2 / LT1 range. Then roll into more structure and be ready for the early April races.
FWIW, and maybe not what you are asking… Have seen folks do very well with 3 year macro-cycles. Basically you train structured for 2 seasons culminating in a big goal and then take a season of less structure to recover physically and mentally. For amateurs, particularly older amateurs, this seems to work very well. Guys doing it will “peak” for changes in age groups. For example targeting max fitness the year they can bump up to 45, 50 or 55 chasing state and national titles. Takes commitment, discipline and a long view, but works extremely well.