So many variables.
Given the relatively moderate spring pressure and lift of MY WIFE'S 421 Tripower cam, CompCams hydraulic roller cam and lifters, limited miles and usage, and a similar split 80/20 or 70/30 street/strip use, I honestly don't EVER expect to have to service them.
Modern high performance engines have had hydraulic roller lifters since?? decades now?
So depending on spring pressure and other wear factors, you have to consider that, but you may never have to service them.
If you already have them, ask the vendor or manufacturer.