Accepted (for processing) is not the same as Approved, which is a a later step, and then Refund Sent. TT gives you an estimated refund (not acceptance) date, based upon the IRS goal of 21 days.
But March 30 is 21 days after March 9 (yesterday), so it couldn't have been in pending for 72 hours. Something is not adding up. Exactly when did you file? And exactly where does it say Pending? TT? The IRS website?