if you want them have a max of 9 or 10 games
How many daily games should you have?

Pick one:
a. As many as you want
b. As many as you need
c. As many as you can handle
d. All of the above
e. None of the above

I can reliably report that 44 is getting to my upper limit, even with them all being 2 and 3 days / move.

Max 20 games , if you are unemployed and have no real friends and no family you CAN Play hundreds of games

You should have 27 daily games, obviously. When one ends you should start another instantly. If the next round of a tournament starts you should instantly resign as many games as needed to drop back to 27.

When I had 15 games I wanted to take a break but now I have 23 and it's actually not that bad. Debut is almost automatically now, and for mittelspiel I can take as much time as I need. And tournament opponents tend to be quite cautious and slow, so I don't get overwhelmed - usually I have no more than 10 simultaneous moves to make.
467,000