The 25-year-old actress was released Monday morning, less than five hours after checking into the Century Regional Detention Facility in Lynwood, Calif., according to the Los Angeles County Sheriff's Department.
Lohan was booked at 8:48 p.m. Sunday even though she had until Nov. 9 to turn herself in. She was released early because of jail overcrowding.
The sheriff's department website earlier said her projected release date was Nov. 16.
A judge revoked Lohan's probation last month after the actress failed to show up at her court-ordered community service at a women's shelter.
Lohan's next court appearance was scheduled for Dec. 14.
After serving her jail time, Lohan must complete 12 days of community service at the Los Angeles County Coroner's Office and also complete four 45-minute psychotherapy sessions by Jan. 17.
Lohan must also complete an additional 12 days at the Los Angeles County morgue by Feb. 15, and serve another 17 days at the morgue and complete six more therapy sessions by March 29.
This is the "Mean Girls" actress' fifth jail sentence since being arrested twice for drunken driving in 2007. Her probation on that case is nearly over, but her release remains supervised after Lohan in May pleaded no contest to misdemeanor theft for taking a $2,500 necklace without permission in January.