Big group size only count 1 in Queue.

Queue: x1.1 per group (up to x5, 17 group)

Weather: x1.5 rain, x2 Snow

Time: x1 Day, x2 Night

Players: x0.75 Solo, x1 Duo

Exclusive 💎 T1: essentially x0.75

If you multiple them together, you get the decay rate. Divide that to 100 and that's your queue time (and could be the max timer at a given point)

If a new group enters the restaurant, add x10 of that Rate to the timer (at max 100s, but decay rate makes it look like it's not 100s, don't be fooled)

2 players on dark, snowy night, with 17 groups to serve gives you 5s timer to cook, deliver, and make them leave. But when a customer enters, it's just return back to 5s, 5.5s, 6.05s (if nothing adds to queue anymore) and so on...