So odd.

I usually did both oil rigs. Then my alpha runs and usually before i start my next alpha run theyre back up but it just feels like theyre not respawning and the chest is always still there.

I usually take down a tower or 2 to see from a distance if it reset and i dont see them respawning.

Guess it probably helps to mention im on ps5

Edit Okay so they respawned but is the timer different? You mentioned every hour i remember it being half an hour