More reasonnable default timeout (2 days instead of 30). Note that using 30...

More reasonnable default timeout (2 days instead of 30). Note that using 30 days was overflowing the unsigned integer taken by the poll system call for the timeout. Indeed, the timeout is given in miliseconds and thus the maximum value is around 28.4 days :-) With 30 days, the number went negative, meaning (under linux) we were having a blocking call.