I believe in most states the recount rule of thumb is one half of one percent (paid by the state).
Hope you have a spreadsheet handy. :-)
Latest from PA Department of STate:
CLINTON, HILLARY
(DEM)
47.20%
Votes: 839,411
Runningmate: TIM KAINE
TRUMP, DONALD J
(REP)
49.30%
Votes: 876,641
Runningmate: MICHAEL R PENCE
JUST TIPPED TO TRUMP!