The time control for correspondence (online) games represents time PER move and not time PER game.
How game time works

On chess.com, correspondence chess time controls are measured per move; for example, in this case the time control is 2 days per move.
Okay! I thought I was going crazy. But I just don't understand how things work, obviously.
Yesterday, a match that had stalled out and my opponent had 17 hours left, finally made a move. Now, it says he has 2 days left. So, clearly I am not understanding. When it says 17 hours left, that means he has 17 hours left on his two days, huh? Not 17 hours total left in the game? Duh?