For a high volume athlete, I would reduce zone 1 and 3 and focus primarily on zone 2, 4, and 5, with about 80% zone 2, and the rest zone 4 and 5. Of course, this would vary a bit depending on time of the season. However, for a lower volume athlete this is not practical as it does not provide enough training stress. For a low volume athlete, perhaps 50% can be zone 4. It is hard to know if what you are doing is appropriate without knowing your training history and current volume.

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Simplify, Train, Live

80% in zones 3 or lower
15% zone 4
5% zone 5

What happened to the sweet spot zone...85-95?

Thanks for the responses ya'll. Some info: Pre-2013 I mostly did long course, then decided I needed to go shorter and work on speed. I'm 43, 5'10", 140 lbs. A pro who stayed at our house commented that my legs "suck for cycling" to give you a frame of reference. Anyway, my go-to workout week (in-season) typically looks like this:

TUE - 70 minutes on trainer - some variation of 3x15, 2x20, etc. @ FTP
THUR - 70 minutes on trainer - 3x5 @ VO2
SAT - 3 hrs outside (combo of flats & hills) - 2x20 @ FTP, 1x60 @ z3, remainder @ z2 (70%)

FTP (and zones) were determined with the NP of a 2x20 test.

Every 3rd week I'll cut the intensity down. Sweet spot? I really only was doing that during the off-season; maybe I should alternate that and the VO2?

The reason I am asking is that the past two seasons about this time my "sucky cycling legs" start to die off so I want to make sure I'm spending the right amount of time per week in the appropriate zones for getting my speed up. I didn't think this was an aggressive routine, but maybe it is?

2.5 hours @ FTP seems like a lot for 5.5 hours of cycling. I guess I have been going too easy.

I don't think I can do more than an hour at FTP without killing myself so I'll try 3x20 minutes @ FTP on Tues and Thurs and another 30-60 minutes @ FTP during my long ride on the weekend. That way I'll hit 50%. Sound about right? Maybe do sweet spot every 3 weeks as a recovery?