How many games a day?

At your level, you should not play any bullet or blitz games. Playing such fast time controls would have zero learning value.
best would be to play two or three daily games, so that you could both think about your moves and do research on the openings used. This type of active learning produces the fastest and most effective learning.
if you do not want to research the games while playing, then you could try two or three ten minute games. This will give you time to think during the game. But at your level you will be making many mistakes. So it will be crucial to analyze the games afterward.
If you need help, please contact our Help and Support team.