It really depends on the day:
Some days I hardly get a doodle done and other days I draw 10+ hours
There's no in-between for me, send help
But honestly, I think it can be quite toxic when ppl try to measure your art and 'how much you actually want to be an artist' through how much you draw/ don't draw per day.
Sometimes you need a day off to gather your thoughts, and research and studies don't necessarily equal time spent actually drawing - you could spend time watching tutorials or thinking some story related things through, and yes you would need to practice those too of course, but having some incubation time >does< help you evolve as an artist also.
Also you have to think about every artists individual situation: some are going to school, some are working full time jobs, and every artists family/home situations are also different, so it's never a 1-1 comparison between every artist
I think the most important thing is for oneself to feel that you're improving, no matter what speed you improve at :>