Maximum number of days to keep system hibernated under regular use

Hi,
I have been trying this. Using the system daily and 8 logons as an Admin and also as Guest. (So it makes 10 logons). The usage tends to vary from 10 min to 2 hours depending at each logons.
I could manage 10 days without restarting. Ofcourse during this period there were no critical Windows update. After 10 days the explorer tends to get disturbed/malfunctions. Trying to close the explorer thru Task manager or a self written batch does not work. I would be compelled to restart , during such times the logoff and shutdown seemed to hang and I would go for the HARD Switch off/on.

Theoretically such an event should not arise , EXPLORER seems to be the one that gets affected. In may case clicking on the folder tab in the systray , while the network discovery is on (I have posted a separate thread) seems to put it off. Any clues on this?

I don't think there's a "maximum number of days" that a computer can be kept in a state of hibernation. Although from what I've read, a general rule of thumb seems to be based on whether the user is more concerned about saving energy or reducing boot time.

Hibernate vs. Sleep vs. Shut-Down | Windows 7 Maintenance | Windows Tools, Help & Guides

As far as why Explorer seems to hang every so often, it might be a case of something called "Single Event Upset". A power glitch, for example, could cause a logic state to change from a 1 to a 0 or vice versa. In software, the computer can get caught in an infinite loop. A simple shutdown or reboot (power-cycling the equipment) can cure many such problems by forcing the computer to restart from a known good state.

Power Supply Design: Trouble Shooting Electronics