I was researching what general range I should be targeting for my weekly TSS (training load) and came across this great chart:
How To Plan Your Season with Training Stress Score
How much weekly TSS any particular person can tolerate depends a lot on your fitness level, recovery rate, what you're training for, etc
The basic coaching advice seems to boil down to ramping up your weekly TSS slowly
and seeing if you can sustain that level for three weeks before taking an easy week to absorb the training and recharge before starting a new block at a slightly higher load.