Washington, D.C. is 10.75 hours behind Kathmandu
There is no standard 8-to-6 overlap. Someone joins early or late.
Washington, D.C. is 10.75 hours behind Kathmandu, which is far enough that a normal 9-to-5 in one city never reaches the other's working hours. One practical option: Washington, D.C. dials in early while it's still late afternoon or evening in Kathmandu. These times hold for most of the year, but Washington, D.C.'s daylight saving (which Kathmandu doesn't use) shifts them by an hour twice annually.