I'll be right back - This is when the person who says this has the power to come

This is when the person who says this has the power to come back whenever they feel like it.

I'll be right back! (he left for a minute) He came back like he was never gone.

I'll be right back! (he left for 10 minutes) He came back with a new attitude.

I'll be right back! (he left for 1 hour) He came back like it was just a break.