Umteen Hours Edit Meaning

1.

it is an undefined amount of time, a lot of time but it hasnt been exactly count or kept track of

you've been gone for fifty-elevendays umteen hours

See fifty-eleven, usher, burn

2.

A word Usher says in his song "Burn" that I have never figured out what it means

Its been fifty eleven days umteen hours ima be burning till you return