Nonsense. The bombardment lasted for 33 hours, beginning at 4:30 in the morning on April 12 and continuing until the afternoon of the 13th.
As for the rest of your post, one can only wonder why the Confederates were so convinced they were starving the garrison, and why Anderson wrote that his men were running out of provisions and would be forced to surrender within days if they were, according to you, gorging themselves on chocolate and all the rest of the items you list.
all i know is what was reported by one of the faculty members of The Citadel (who, unlike you & i) was there on the scene.
i see NO reason that he had to lie about WHAT supplies were delivered & WHEN they were delivered to the fort. (frankly, his displeasure, at the rather "soft manner" that the persons in the fort were treated by the Charleston merchants & the city "fathers", comes through in his account.)
as for 33+ hours of bombardment, the bombardment such as it was, occurred over that period but evidently was neither continuous or great in numbers of rounds fired. (i therefore suspect that it wasn't much of a battle, when compared to an artillery bombardment of today or one of the sort at later battles of the WBTS.)
free dixie,sw