How many checks or orders can you do at once? I work on the starters and deserts section at the moment and most of the stuff I prepare is pretty simple and there aren't many things that need a lot of time to cook. So I tend to do about 3 checks at once. Or if they are small checks maybe 6 or 7 orders at once. I haven't been in the kitchen for that long so that is about my level at the moment and I can't really handle more than that. So I do those orders get them out the way then move on to the next ones. I find the most important thing during service is not to et overwhelmed or confused and know where you are at all times and that system works for me at the moment. Although I am trying to push to be able to do more but it takes time.
How many checks or orders can you do at once?
This all depends on where you work.
Each place is different.
Some places have a simple ticket system where there's a wheel that the tickets clip on to. In this case, it is as you describe, working on tickets as they come in.
Other places have a person in charge of all of that ( Expo ) who calls out the orders and you work on one ticket at a time accordingly.
Now I work on a 4 man line where the chef expedites and plates mostly everything. The expo table can fit about 15 plates so during service we work about 15 entrees at a time. Hot and cold apps go out asap, and when entrees go on fire it's "this push, 4 halibut, 2 scallops, 2 duck, etcetera."
I find it helpful to think in terms of waves. 7 items becomes your first wave, then you work on the next one. It's easier than thinking of them as 7 separate things, and remembering 2 groups of orders is easier than 14 things for me.