<Table> <Tr> <Th_colspan="2"> Governor of the Commonwealth of Pennsylvania </Th> </Tr> <Tr> <Td_colspan="2"> Flag of the Governor </Td> </Tr> <Tr> <Td_colspan="2"> Seal of the Governor </Td> </Tr> <Tr> <Td_colspan="2"> Incumbent Tom Wolf since January 20, 2015 </Td> </Tr> <Tr> <Th> Residence </Th> <Td> Governor's Residence </Td> </Tr> <Tr> <Th> Term length </Th> <Td> Four years renewable once </Td> </Tr> <Tr> <Th> Inaugural holder </Th> <Td> Thomas Mifflin </Td> </Tr> <Tr> <Th> Formation </Th> <Td> December 21, 1790 </Td> </Tr> <Tr> <Th> Deputy </Th> <Td> Lieutenant Governor of Pennsylvania </Td> </Tr> <Tr> <Th> Salary </Th> <Td> $187,256 (2013) </Td> </Tr> <Tr> <Th> Website </Th> <Td> governor.pa.gov </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Governor of the Commonwealth of Pennsylvania </Th> </Tr>

How long is the term of governor in the state of pennsylvania