i'm in the process of setting up a new router (C1200) on a spare computer which does not have internet access.

for the time being i've set up the time manually but each day when i go back into the router configuration i can see that the router has lost a few minutes compared to the PC clock.

eventually when i hook it up to my primary computer i'll change the setting to get the time automatically from the internet.

firmware is at the latest version.

but i'm curious about two things:

1. why is the router losing a few minutes each day?
2. once i switch over to get the time from the internet what is the frequency that the router uses to keep the time correct (e.g. once a day, once a week, etc.)?

thanks!