Orders placed prior to 3 PM EST should be executed the same day; trades placed after 3 PM EST should transact on the following business day.
Typical trading hours are Monday - Friday, 9:30 AM - 4:00 PM EST (excluding holidays).
Stock Bits orders are typically processed each trading day at around 3:30 PM EST and the executed trade can be viewed in your transactions once the market is closed.
NOTE: Fractional share trades are typically processed a half an hour before the market closes, which is 3:30 PM EST.