How many connections can my isp handle?

I'm relaunching my internet business with some nice tools (scrapebox, etc).

5 Years ago my ISP banned me when i was using PRstorm with a lot connections at the same time. I think i got the temp. bann because the number of connetions/threads/lines at the same time. Now i'm using scrapebox for a few weeks (no bann at the moment) but with just a couple connections at the same time (not that fast ). Is there a way to find out how many connections i can use before i get a bann. Yes is can go up untill the bann, but that is not the way i want

Bag thanks

No, there is no way to find this out and your router would eff up long before your ISP said jack. Anyways, why not just invest in a dedicated box or VPS to play safe?