How to salvage a rejected paper when you don't have time to correct it?
One piece of advice-I-would-not-follow is to submit the paper to a lower quality conference. This could really be a waste of time if the conference is of very low quality, and if you are really proud of the work, do not do this. In the end, this may even look like a black spot on your CV. 

What are you doing this weekend? Maybe canceling those plans and using the time to obtain the additional results. Then improve the paper based on the reviewer comments (evenings and other weekends) and resubmit to the next suitable venue.

Another alternative is to get help, either from a colleague or maybe even an undergraduate, if it is easy enough to the him/her how to run your experiments. Reward them with co-authorship, even if they haven't written a word of the paper. (This won't hurt you any.)

Ultimately, you cannot get something for nothing.