do you "storage" your lipo after every use even if the voltage is near 3.8, or just live them until the next charge?

i use each pack until every cell reaches the voltage between 3.78-3.84, so if it is sure that the next weekend i will charge them again, can i leave them as they are or i have to put them in storage mode in order to reach 3.8v per cell? To be more specific, how many days can i leave the cells between 3.75-3.85 whithout damaging the battery?

another question is how long can i leave them fully charged? Can i charge them from the previous night and go to the track the next day?