i use D,addarios flatwounds on my Fender P bass. i just wanna know whats the most they last up for 

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On a related note, I was just wondering if they never change strings, how/when flats players clean their fretboards or polish frets?
Flatwounds, if made properly will outlast a bass.
James jamerson was probably the very best example of a serious flatwound player.
He used the LaBella Originals on his P bass for ever...Never changed the set.
Today players like Duck Dunn, Chuck Raney and Bob Babbit Still use these sets.
As a suggestion, merely wipe the strings top and underside after playing...Never, I meaan Never put any stuff on a string.
LaBella strings, STILL HANDMADE, STILL THE SAME OLE WAY......
reed mathis used the same set of roundwound strings for 17 years, on tour the whole time with JFJO.
flats are made to last longer. so there you go- however long you want.