How much salary and asset can save parents time not to fill in FAFSA?

$101,000 income with $1,000 assets is a lot different from $300,000 income with $10,000,000 assets.

Anyway, no need to guess. Run the net price calculator on all colleges under consideration to see if there will be any financial aid at any of them. If not, and there are no merit scholarships that require FA forms, then there is no need to file FA forms.