What is the appropriate time for a defendant to be arrested and charged under the 6th amendment for delay counting for the purposes of the sixth amendment?

In order to determine the length of delay for sixth amendment purposes, we must know when to begin counting and when, if ever, to interrupt counting. It is clear enough that the speedy trial clause does not apply "before a defendant is indicted, arrested, or otherwise officially accused." United States v. MacDonald, 456 U.S. 1, 6, 102 S.Ct. 1497, 1501, 71 L.Ed.2d 696 (1982). We begin our count, therefore, with defendants' arrest on November 14, 1975. The question then is whether, and for what purposes, we must interrupt it.