Budapest is 4.75 hours behind Kathmandu
Best overlap: 12:45 PM to 6:45 PM in Kathmandu is 8:00 AM to 2:00 PM in Budapest.
If you set up a recurring sync, 12:45 PM to 6:45 PM in Kathmandu (8:00 AM to 2:00 PM in Budapest) is the natural home for it. With 6 hours of daily overlap, these two cities are an easy pairing; almost any reasonable hour works. Because Budapest and Kathmandu don't both observe daylight saving, plan to re-check the overlap around March and November.