Welcome to the forum!!
How long have you been throwing? Guessing you are new to the game. Can we ask how old you are?
5 hours a day is a lot and as Alberto pointed out, don’t neglect what really needs doing! That said, I’m always holding / throwing mine. I put in a couple hours in the morning and sometimes more in the evening so I’m right there with you. Just find the right balance that works for you.
To your original question, it’s pretty common for your finger to react to this new thing you’re doing to it. I’ve found that wrapping with a “double slip knot”, you can avoid the callus. It’s wrapped like this. Let me know if you can’t see the pictures. I think the admins are working through a bug on the site right now.
String rotating on finger - #6 by Shwa
Too, pop into this thread and introduce yourself. Not required but it’s something I missed and wished I had.
To you last question, no need to close or delete a thread. The admins take care of all that. Here is a link to the forum rules.
Explore the site and have fun! There is a ton of great people and resources. Seek out the FAQ page for all the official rules.
Good luck!!