Although Lindsay Lohan got sentenced to four days in jail for her two DUI convictions last August, she's managed to get away with 3 days and be left with only 24 hours to serve behind bars.
Lohan was given credit for one day served from her July arrest and then she traded another two days in exchange for 10 days community service ... which she has began serving yesterday.
Lilo was spotted at an American Red Cross blood services facility in L.A. yesterday. Arriving at around 12, she was greeted by staff before walking into the building. When she left the facility it was after a long day, at around 7 pm.

As for the rest of her sentence, she's going to serve 24 hours in jail in January and will have to complete an 18-month alcohol education program.
Oh! She's also placed on three years probation.
As for how she passes her days, Lilo has been busy shopping these past few weeks ... that's basically what she's been filling her empty time with!