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We finally know how much time Diddy will spend behind bars after his transportation for prostitution convictions ... and a sex worker and exotic dancer involved with the case are weighing in on the conclusion.

As you know ... Judge Arun Subramanian ordered Diddy to serve a little over 4 years in a federal prison ... but he's already spent over a year in jail and will get credit for time served. Instagram / @getpunished

Sharay Hayes -- the exotic male dancer nicknamed "The Punisher" who testified during Diddy's trial, tells TMZ ... at first, he thought Diddy should've been freed today for time served -- but after hearing the judge's reasoning for several more years behind bars ... Sharay says he concurs.

Sharay tells us the judge sent

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