Hello

I tried to use the search function - but didn't find an answer.
I'm planning on flying DUS-AUH-MLE.
While DUS-AUH is only available in First and Economy -> AUH-MLE is only available in Economy. I was planning on using an AA award in First:
DUS-AUH (F) and continue AUH-MLE (Y)

Can I use the First Class Lounge in AUH?
The layover in AUH is 14 hours. Any problems in using the lounge for such a long time?


Thanks already for an answer
C1