Depending on your FFL Type there may be different requirements on how much time you have before items acquired must be acquired into FastBound.
Dealer - The required acquisition information must be recorded in your A&D record no later than the close of the next business day following the date of acquisition.
Manufacturer - The required acquisition information for each firearm manufactured and the date of such manufacture or acquisition shall be recorded not later than the seventh day following such manufacture or other acquisition.
Importer - The required acquisition information for each firearm imported and the date of such importation or acquisition shall be recorded within 15 days of the date of importation or other acquisition.
For more information consult the FFLGuard Help Desk