Frankfurt 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 Frankfurt.
Both teams are at their desks between 12:45 PM to 6:45 PM in Kathmandu and 8:00 AM to 2:00 PM in Frankfurt. 6 hours of shared hours is more than enough — slot meetings wherever they're most convenient for the people involved. A quick caveat — Frankfurt's clocks move for daylight saving and Kathmandu's don't, so the times here are right for only part of the year.