If you drove it after filling it in, then you are good. It shouldn't drop at all. Well maybe a little, but I doubt it very seriously that it will ask you to add more. You should be fine for a while. How often do you have to add oil? I usually have to add at around 3-5k miles. It also depends on how hard I push her.
'09 E92 ///M3 Interlagos Blue, 6MT
, Silver Novillo Leather, CF Trim, Premium Package, Technology Package, Cold Weather Package, Premium Sound, 19" Wheels, Moonroof-Toy//
'02 Nissan Xterra- Daily Driver/
'04 Yamaha R1- Toy/
'06Yamaha Raptor 350- Toy