We had BT anytime in our house of three students. Between the three of us, mainly using Kazaa, it was pretty much on all the time, left overnight quite often. We had several emails going to the BT account that no one checked, and I think eventually they cut us off, or were just about to, before someone noticed the emails and we dialled it down a bit. I do think there is a clause in the contract about keeping it below 150hrs, but the main reason that we had problems was long periods of inactivity, when kazaa had finished and it was just doing nothing. We had it setup to redial instantly after the 2hr cut off. Eventually we said 'sod off' to them and we are with OneTel broadband now. If you are using the internet for 150hrs +, then i definately recommend upgrading to broadband. Sooo much faster, dials instantly, and this definately can be left on all the time. No regrets.