I think this is saying that Windows starts assigning ephermal ports at 1025 and a common rate of web browsing uses 55 ports after about 2 minutes, at which poin

I think this is saying that Windows starts assigning ephermal ports at 1025 and a common rate of web browsing uses 55 ports after about 2 minutes, at which point ports above 1080 start to be assigned and are blocked.