PSA: After the 20 minute mark both teams get the Homeguard bonus when coming off of their fountain.

Homeguard

So, if you think to yourself can we push for just one more turret or the inhibitor after the turret or are we overstaying? You are probably overstaying. Definitely do not chance this if you don't have the minions in the lanes pushing toward the enemy side of the map. Get the easy objective and get out!

I will sometimes call this out in chat and I've noticed when I do that my teams will play a little more carefully around respawn times.

Remember if you screw this up you will have 5 angry, fully healed, and having just purchased champions in your face much quicker than you might anticipate if you don't take the homeguard bonus into account. It is a recipe for getting wiped and losing a whole lot on the map especially if your minions are not pushing toward the enemy's side of the map.