Will I only receive a 2-day extension if I stay in a hotel for just two nights for TM30 reporting?

hi. as read in threads here, as i failed to fill tm30 at the beginning of my stay, i will go tomorrow staying 2 nights in a cheap hotel so they fill one for me. i was warned by this hotel receptionist though that since i will only stay two nights that, based on this tm30, i will be only granted 2 days extension max. is that true ? if yes what do i need to do? give proof of my following month bookings aswell ?

thanks