Cavalier clutch losing pressure on 2003 Chevrolet Cavalier

The clutch in my 2003 Cavalier is losing pressure. The clutch fluid has been bled several times and each time there is air in the hydraulic line but the fluid isn't leaking out. I'm told I need to replace the slave cylinder. Is this true? About how long should that take? Is there some other way air could be getting in?

Asked by for the 2003 Chevrolet Cavalier
clutch line is cheapest and rely's on useless connections from master to slave start there