According to Sirius' contract with Howard Stern, Stern will only work 4-day weeks. Right now at Infinity, Howard only gets 8-weeks of vacation but once he moves to Sirius next year he'll get 10-weeks of vacation per year.

42 weeks @ 4 days a week = 168 work days a year

And that's not counting holidays. Gotta hand it to Howard, he got the deal of the century.

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