Montevideo is 8.75 hours behind Kathmandu
Best overlap: 4:45 PM to 6:45 PM in Kathmandu is 8:00 AM to 10:00 AM in Montevideo.
Plan around 4:45 PM to 6:45 PM in Kathmandu, which is 8:00 AM to 10:00 AM in Montevideo, to catch everyone during office hours. Montevideo is 8.75 hours behind Kathmandu, so common hours are scarce (about 2 hours). Lock the slot, keep it short, and follow up in writing.