recording size

Hey everyone. I was directed to a forum here that i didn't quite understand (It also appeared to be quite old) *IF A CURRENT FORUM EXISTS FOR MY QUESTION PLEASE REFER ME THERE* Here's my question/issue. I created an overlay for console streaming, and used the standard screen dimensions...

I recorded a 35 minute video in 1080p60, and it ended up at 5 GB, which is very large. I have movies which are 1,5 hours long and they are Just a bit over a GB.

So I was trying to record myself drawing something so I opened up OBS and pressed record then 20 minutes in it says that my disk space became full and when I stopped recording to see how big my recording was it said 11GB so I immediately deleted it but I'm still confused as to how it took up...