I just started this summer. I've played rock band drums maybe 10 hours and probably twice that tabletop finger drumming along with music, plus a small number of times tried playing at training facility, sometimes with the band as well briefly.

The challenge is playing accurately with the click...and double hits on kick without hitting same with hand...and starting fills sometimes with left hand...smooth 16th note beats. .well actually a lot of things :-)

But yeah...now I have maybe 10 hours on it and I can play accurately enough for easy quantization and basic beats/basic rock songs. I could easily play in a ramones type band I think.