Nano vs. 90gal

[20yrs90gal]

I'm traveling way more than I have in the past and I'm gone 3-4 days a week now. My 90 gallon is suffering significantly from lack of attention - I know the problem/problems, just don't have time for maintenance. Also, I only feed once/twice/week due to schedule.

Does anyone know if the Nano would require much less maintenance like everyone says?

How long can you go without water changes on Nanos if fish are kept to bare minimum?