Reykjavik is 6 hours ahead of Houston
Best overlap: 8:00 AM to 12:00 PM in Houston is 2:00 PM to 6:00 PM in Reykjavik.
Your window to reach both cities is 8:00 AM to 12:00 PM in Houston, which converts to 2:00 PM to 6:00 PM in Reykjavik. Reykjavik is 6 hours ahead of Houston, leaving about 4 hours of shared hours — plan recurring calls early in that window to leave buffer. Bear in mind Houston shifts for daylight saving while Reykjavik stays fixed — recheck these hours after each clock change.