call length max
I've been using a google voice number as my 'work phone' for almost a year now. Works great, love the SMS feature (rather than having to pay for a ridiculous Verizon texting plan) there is only one drawback I've found.
Apparently my co-workers and I like to talk too much. When some of our conference calls exceed 2 hours my google voice call disconnects and I have to dial back in.
Now, this could be seen as a feature (hey, we have to limit our conferences to 2 hours folks!), but it is a bit of a pain when we do have the occasional long development meeting.