Wire nut several wires together
You would not bundle seven under one wire nut. I expect someone will amplify my answer with direct code call out. Basically, no more than 4... almost EVER, under any wire nut, and you must use the nut sized for the largest collective wire awg you are using. (not just buy a larger wire nut to stuff more inside of it).

Further, do not exceed the current rating of the breaker and in general having a situation like this begs the question whether it is smart to run another circuit to break up the load and the distribution path. Either way, exceeding 4 is typically not advisable and a fire hazard.

What you would do, is use up to 3 neutrals and a ~6" white jumper, and then 2 more neutrals, and another ~6" jumper, followed by one more wire-nut with 2 neutral and the end of the last jumper. Here you are distributing the wires as even and safely as possible provided it fits safely in the box and the circuit is not overloaded.

The box for the nuts you intend to buy certainly should list a limit on them. If you tell us the gauge (all are 14awg)? And the brands you are looking at it would be easy to lookup their recommended limits. E.g.: https://www.idealind.com/content/pdfs/catalogs/wire-connector-catalog.pdf