The writing has “been on the wall for well over a year now” that SiriusXM wouldn’t be renewing Howard Stern’s colossal contract — and his employees have been taking advantage, “coasting” on the clock and trolling for new gigs, two current show staffers told The Post.

This week, reports surfaced that the “Howard Stern Show’s” “19-year run at SiriusXM was nearing its end , with his $500 million contract expiring at the end of the year and an audience that’s apparently dwindled from 20 million a day to 125,000.

Some of the show’s writers have been their best jokes for themselves, to use after the show’s eventual demise, one worker said.

Staffers said they’re certain the show’s ending this winter, whether by Howard’s choice or SiriusXM’s. GC Images

“Most of us have been coasting at work

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