i personally think 30 minutes. you can think about each move and you can see traps easier so you can actually get into the game.
Best match time to lern chess? 5, 10, 15, 30 minutes?

#1. I play OTB with 75 min on the clock. So from your pick list I would go 10 min or 15 min.
It is not so much the time or even the result but rather getting to the strength where you do not hang or drop material. It depends also on your chess desires, if you are happy with a complex version of connect-4 then blitz is fine.
Hey,
Or better to play one 30 Minutes match and try to think deeply in every move?