TCP connections that stay open

Every once in a while I get a customer who cant surf because they have hit their limit of 80 tcp connections. Usually this is due to filesharing, but sometimes I see legitimate tcp port 80 connections that dont close when they are done in their browser. The connections Just stay open. to get them online again i just delete the stuck connections in the firwall-connections area. They dont come back after i clear them. Can i change the 24hour timeout on tp connections in the connection tracking area to something like a couple hours or will this cause issue?

Yes, you can change that.
No, it likely won’t cause an issue.