The relevant thing is not really the number of days alone. You must have also met the "residency requirement" which is not met just by entering the US and leaving the next day. You must have both, physical presence for at least 2.5 years + have been a "permanent resident" for 5 years. This means the place where you work, live, bank, have your insurance policies, utility bills, etc. If you do not have this evidence, then don't even waste your time and filing fees because you will get the application denied.
If you do, then congratulations and just make sure you count the days not be short by even 1 day. Best of lucks!