For YYE bulk poly I get about 1-2 hours of play. Kitty 1.5 I am averaging 5 hours. Which right now would be about 2 months on a poly. Just bought a house and I have gotten through most of the honeydew list.
I bought some AMMO recently and I didn’t really like it. To thick for me. So I went to KittyString and I love that stuff. I bought $20 dollars worth of normal and slim string. I have pink for my Purple Popstar, Blue Grind Machine, and Nickel Plated Smooth Move. I got yellow as extra string.
It depends. When I had time last year and was throwing quite a bit using YYE bulk 100% polyester, there were many days where I could go through 2 or more strings per day on a single yoyo. Some people go through strings faster than others. Strength, type of play, yoyo, bearing, response, it all makes a difference. Also, off-strings can wear strange since you have to deal with your hand of your non-throw hand moving up and down the string too, as well as transitioning the string between hands, so it can absorb more oils and dirt faster and might need more frequent changing.
That didn’t happen very often. I also don’t change strings unless I need to either.