Adaption takes 2-4wks to see results.
Regarding total volume question its a bit of column A and column B which i refer to as the micro and macro progression
There is the progressive overload that comes from the workouts themselves, that is doing longer or harder intervals within the workout itself, and increasing overall TiZ for the workout. (Micro)
Then there is the progressive overload that comes through a block of training, that is doing more work week to week as you increase the overall load through the block. (Macro)
You combine both of those pieces and you get the micro adaption and macro adaption occurring as you progress through a block.