I am not taking about Parole or Probation. Time sentenced in certain jails or prisons would be counted as 2x or 3x more the time served. So cases are often delayed by the lawyers so that felons stay in these jails longer and can come out early. The podcast has more details. I am myself not well versed with the exact terminology.
I'm not going to reply to all of your follow-up comments, but it simply isn't possible to get 2x or 3x time served based on where you serve your sentence.
The 2x time served is a good conduct credit equal to one day of conduct credit for every day served on good behavior. If you misbehave or commit further crimes in jail or prison, you don't get the credit.
Violent felons get significantly less credit for good behavior (15%) and murderers aren't even eligible.
Updated my original comment for clarity.