How long can painted turtles go without eating?

i fed my Painted turtle ReptoMin and worms for almost a year, then it went 3 or 4 months with out eating anything!

i thought for sure he was a goner, but he started eating ALOT! the last 2 or 3 days :)

Now I don't know if that is normal or not, it started just b4 winter, so i thought he was in Hibernation ,but it is still winter so I'm not sure why he stopped / started eating again.

and I'm not sure but i think he may have been eating small stuff /like kinda filter feeding during the time that it did not seem like he was eating.