I think as long as you meet the daily quota it should be fine. I managed to finally get through day 6 and 7. in those days I think you really have to sacrifice someone and prioritize other tables more, like you can leave the fourth time a customer comes in 6? the sailor girl one imo
Just have to remember these:
each person is 200.
Had to watch a playthrough to see their strategy beating it and how it is for me:
the four seater as nerve wrecking as it may, get them nonehtless as they are the ones that give a lot, they can wait a lot of time even after the shift. i went by prioritizing twos and ones first, after they're done with a set, i get back to the four. while two is eating/getting their order, i got the one seater only to serve them as much so they can pay quickly after.
The more persons, the more patience they have. If it helps, you can equip the cologne too and hold shift everytime. Press the switch every time you get an order and come back