The Governor of Kerobokan jail has confirmed that Schappelle Corby's sentence will end on September 20, 2017.
However, the 34-year-old convicted drug smuggler may be released sooner if granted further remissions for parole.
Corby can apply for parole as early as next week and her sentence could expire in 2015 if she is awarded the maximum eight months per year in remissions over the next two to three years.
However her lawyer Iskander Nawing is not optimistic about it being granted, and there has been criticism in Indonesia of the mercy shown to Corby so far.
Corby, who was arrested in 2004 attempting to smuggle 4.1kg of marijuana into Bali in a bodyboard bag, applied for clemency two years ago on the grounds she was suffering from a mental illness that could endanger her life.
This was granted by President Susilo Bambang Yudhoyono but Constitutional Court Chief Justice Mahfud MD has called for the decision to be explained.
"Drug crime is worse than corruption and terrorism," he said.
"In corruption and terrorism cases, if the perpetrators are (sentenced) to death, the case ends with their death. But drugs destroy life. It doesn't only kill the life of one person, but it destroys the life of the next generations."
He said it was normal to question the reasons behind the clemency as drug-related crimes were some of the worst and should carry heavy sentences.
The jail's governor Gusti Ngurah Wiratna has described the 34-year-old as a well-behaved prisoner in comments that could boost her chances of parole.