how long can you store lipos charged?

after a run ( at this time my lipo should be at 20% capacity) I wont charge again untill I am certain I will be running again within the next week

[magudaman]

A week should be fine but if they sit for more for a couple weeks or a month it could be risky because the self discharge of the cell could bring it below the minimum voltage of the battery. You never usually want a resting Lipo to go below 3.0v I think.