Sean "Diddy" Combs was sentenced to 50 months (just over 4 years) in prison for his conviction on two counts related to transportation for prostitution. He has already served about 12 months in custody, which will be credited toward this sentence. Prosecutors had sought at least 11 years, but the judge gave a much shorter term. In addition to prison time, Combs was fined $500,000 and ordered to undergo five years of supervised release after his incarceration.
So, Diddy's prison sentence is about 4 years and 2 months, with credit for time served already.
