How long does it take from sunrise to moonset at the equator? Neglect refraction and parallax.

If we neglect the Moon’s parallax and atmospheric refraction, then its rising and setting at the equator occur at an hour angle of ± 6h regardless of declination. For 29.53 solar days (synodic period of the Moon) one revolution of the Moon in the sky relative to the Sun is completed, and thus only 28.53 “lunar days” pass. Thus, the duration of the lunar day is 24h50m, and half of this period passes between sunrise and sunset – 12h25m.