Kathmandu is 8.75 hours ahead of São Paulo
Best overlap: 8:00 AM to 10:00 AM in São Paulo is 4:45 PM to 6:45 PM in Kathmandu.
São Paulo and Kathmandu overlap from 8:00 AM to 10:00 AM (São Paulo) to the equivalent 4:45 PM to 6:45 PM in Kathmandu — that's your meeting window. The shared window is only 2 hours — treat 8:00 AM in São Paulo (4:45 PM in Kathmandu) as the one fixed point and plan everything else around it.