Contingency Question - Settlement date

[Yali Sharon]

Hey BPers!

I am currently in the final stages of negotiations and hope to go into escrow any day now on a great deal. I am leaving the country in 40 days for 6 weeks and wondering how I should go about dealing with the fact that closing might happen during that time. Should I ask for a clause to be added to the offer contract stating that closing must take place before or after those 6 weeks? And is there a chance that will kill the deal? 

Thanks!