How long does a factory issued battery last and when should it be replaced on a 2005 Toyota Camry le?

Usually batteries do no last longer than 4 years, in majority of cases 2-3 years. You can go in AutoZone and run tests for your battery for free. Unless your battery gives problems you have to replace it. If it works fine, then you do not need to replace.

PS: if batteries die, they it really fast.