We Can't Save That Portal End Game?

I play at midnight, and I am so tired, so I decide to rest but that map has 11 breachs arm with map complete status.

In the morning, I open this game, that portal map is Gone :(

So, this game not have feature for saving portal?

Instances are only guaranteed to last ~15 minutes if there is no character inside. After that time portals can disappear at any time. If you want to take a break longer than 15 min you have to stay in the map. You can still pause the game to make 100% sure you don't die while you're away. But you have to keep the game client running. As long as you are in the map instance it won't disappear.