Ideally the less time sitting at full charge the better.

Be aware that charge state is impacted by temperature. If you do leave a fully charged pack at the very least don’t allow it to get hotter, that’s not good. For example don't charge then leave it a car out in the hot sun.

One thing you can do if you have a charger that has a fast charge or percentage charge option, is charge to 90% or so if you are charging ahead of time. You only give up a little run time on your first run.