What is the test for sentencing a defendant to 6 life terms for three counts of attempted murder?

Finally, this does not appear to have been a close case: after a week-long trial, the jury deliberated for only two hours before reaching a verdict. (Compare People v. Cardenas (1982) 31 Cal.3d 897, 907 [six hours of deliberations is evidence of a close case].)

As discussed, the court sentenced defendant to six life terms for the three counts of attempted willful, deliberate, and premeditated murder. The court arrived at this sentence by imposing one indeterminate life sentence for each count and doubling it under the Three Strikes law. We requested supplemental briefing on whether this sentence was unauthorized, and conclude that it was. (See People v. Scott (1994) 9 Cal.4th 331, 354 [court may correct unauthorized sentence on appeal].)