When setting the shelter for troop and hero protection, you can choose between 1-hour, 4-hour, 8-hour, and a 12-hour defense. After that time, all the troops and heroes will be booted from the shelter and forced to fend for themselves. You can also set up notifications to remind you 10 minutes before the time expires to ensure troops can be reset into the shelter. If you happen to come back to the game early, you can remove the troops and the hero manually, even if the timer hasn’t run out yet. You can then put them back again for another time period to prolong the protection.