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The amount of prejudice required in a given case varies with the length of the delay. 'If only a short period of time elapses between accrual of the claim and suit, the magnitude of prejudice required before suit would be barred is great; if the delay is lengthy, a lesser showing of prejudice is required.' Gull Airborne Instruments, Inc. v. Weinberger, 694 F.2d 838, 843 (D.C.Cir.1982). This reflects the view that 'equity aids the vigilant and not those who slumber on their rights,' NAACP, 753 F.2d at 137, as well as the fact that evidence of prejudice is among the evidence that ...