After arriving in Kathmandu, if your climb is in Tibet we will need a couple days to apply and obtain the Chinese visa and the Tibet travel permit. The Chinese embassy in Kathmandu is open for visa processing only on Monday, Wednesday and Friday. You would need to arrive in Kathmandu at least one day before these days for your visa. You would be not required to appear in person at the embassy. Except in special situation you will be issued with a group visa which not stamped in your passport. The group visa comes in sheet of paper with the list of trip participants name and other passport details. In situation that you would need to make an early return for home you will be given a copy of the group permit to checkout from the Chinese immigration at the border.