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I guess there's no right or wrong answer with CTL, mine hovers between 70-80 during racing, bit higher in build and lower in base. That said I'm pretty time confined so I have to cram as much into hour-long sessions; if I was doing a 'proper' base with lots of hours of outdoor riding then it would definitely be much higher.
If you can cope with that much TSS (and by the way that sounds loads, are you sure your FTP is correct in Training Peaks?) then I would have a rest, knock it down 20-25% less than now and then build it back up. But that's only because I always take a month off the bike around October so my fitness takes a hit before starting base. This isn't because legs, it's to stop me getting mentally burnt out after 12 week base + 8 week build...that's quite a long time just getting ready to push up your FTP.
If you have the time and moreover the mental dedication, then make your base longer, say up to 20 weeks. Lots of Z2, lots of miles, regular intensity, regular sweetspot. But just keep monitoring your weekly TSS and keep having easier weeks every month or so.
Great, thank you that's really helpful. I use power so have a way of measuring CTL. Is there a set figure I should be aiming for? Should I expect to take a big dip in TSS for my base block then? The last couple of months have been 800ish with a couple of 1200+ weeks but looking at a week of trainerroad stuff seems a lot lower than that. Should I also be making a concerted effort to not do that much for the next few weeks? I've just been out for a 4x10 sweet spot which ended up closer to threshold (just due to the nature of being outside and in the wind/bumps).
I'll try and work out what I want to aim for in the spring and work back. Is it just a case of doing base until the 8 build and 8 specialism phases?