If i can recall well o3o
-There's a 5:00 min counter that begins as soon as you enter a Field Area. If that counter reaches 0, Doppelganger appears.
-Entering into a battle resets the counter to 5:00.
-Doing any action, such like opening a chest, kicking chims, feeding Mecha Grunty, etc., pauses the counter for as long as the action takes (i THINK using the Bike also counts as an action, so no bike)
-Opening the menu pauses the counter until you return to the game.
-And if you're inside the Treasure Room (or whatever the name was XD) when the counter reaches 0, Doppel won't appear nor the counter will reset back to 5:00. So he's gone from that field.
I think thazzit o3o
There is no use moving back, you can't trace back your path
Time has passed since we had last met, but we never meet without farewell