The problem I have is I can not stop Timer1 because that is where the PWM burst happens.

If I stop this timer I have no way to wake it up so I can not go in sleep mode.

I can only get the LEDs off based on a counter and I guess compare it with its own value from the previous loop.

What I can't figure out is, how many loops I get in one minute? and how much can I count with a word variable?

Perhaps I need to use nested counters? or is there a better way?