How long does a summary offense stay on your record in Pennsylvania?

Check out these two sites. 1st shows the enactment of pa senate bill 232. 2nd is the actual bill.

http://www.philly.com/inquirer/local/pa/20080429_Senate_OKs_bill_on_expunging_summary_offenses.html

http://www.legis.state.pa.us/CFDOCS/Legis/PN/Public/btCheck.cfm?txtType=HTM&sessYr=2007&sessInd=0&billBody=S&billTyp=B&billNbr=0232&pn=0269