Try CutWarn. I've had it for ages and it's very good. Be careful on that site, some of the other downloads may have spyware/adware, but I haven't had any such problem with CutWarn. You can set CutWarn to the length of time you want to be on line and to give you audible and visible warnings for however many minutes you want it to before your time's up. Madeline.
-------------------- "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.