Yes! Artificial deadlines will help you keep a pace and help investors to not drag their feet.
From Karthik Manimaran:
We’ve tried many different ways - setting deadlines, not setting deadlines, saying no to investors etc. The only conclusion we’ve arrived at is that if you don’t set deadlines that are not too far out it almost always results in a No. Our first investor said a yes without even having looked at our product or pitch deck. Most of them don’t need more than a couple of days to say yes or no.