What is the test for determining whether a delay in completing a criminal case was unreasonable?

"It is perhaps an unfortunate, but nonetheless existing, fact of life in a democratic society that only so much time, manpower and money can be expended toward any single criminal case. Thus, we agree with the previously quoted principle [from Jones v. Superior Court (1970) 3 Cal.3d 734, 738, 91 Cal.Rptr. 578, 478 P.2d 10] that only in the case of 'willful oppression' or 'neglect' is the delay unreasonable. [Defendant] does not suggest that the delay was willful; and we hold that under the facts and circumstances here the delay was not unreasonable."