A few men can ejaculate a bigger number of times during the day than others. Younger men will generally ejaculate more often than their older counterparts.
A few men can ejaculate (or come) more than once per day, whereas a few people can do it four or five times.
How many times can a man ejaculate in a day - rely upon several factors, including the refractory period.
A refractory period is a period between the last ejaculation and when you're ready to get an erection and ejaculate again.