Respect his schedule, and make sure he respects yours, too.
Explain that you fully understand his or her passion for the job but that you want some balance so that the two of you also have quality time together.
Even important events such as a family birthday are not enough to convince your date to drop working.
Description: We live in a culture where judging others tends to be the norm. Understand that your date might want you just as much as you want him or her.