220 TSS in three hours realistic?

Training
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Unless it was race situation with no stopping, I’d have a hard time doing that kind of NP for 3 hours on a solo outdoor ride (stopping, coasting down hills, etc.). My favorite high tempo workout is jumping in the Saturday morning Zwift 100 mile BMTR group ride. Not completely steady state because you have to hold wheels to stay with the group, but no coasting and no huge surges. Just pushing continuous deliberate power, pretty much my favorite type of riding/training. Here’s a snapshot of what that looks like from early last season (~4 hours at .85) -

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