Going on two dates is a good general guideline, but Safran also points out that it's possible for chemistry to ignite at essentially any time. "Chemistry can happen when you realize that this person is true to their word, or when they truly listen to you by showing that they care in ways that others haven't," she says.

How long does it take to build chemistry in a relationship?

Three dates is a good rule of thumb.

That's a pretty fair amount of time together. If you're not feeling any sense of chemistry or attachment, it's OK to give up. If you want to keep trying, go for it, but make sure to be careful of his feelings too.

Can chemistry be built over time?

A. Chemistry can certainly develop over time. We know that because arranged marriages depend on it. However, men and women who go into arranged marriages are generally prepared to wait for those feelings to reveal themselves.