6 Months docked
Progress is derived from the manned Soyuz spacecraft and is launched on the same vehicle, a Soyuz rocket. The purpose of Progress is to deliver supplies needed to sustain human presence in orbit. Currently it is used as a re-supply spacecraft for the ISS.
Progress-M is an improved variant of the original Progress which first launched on 23 August 1989. It has the following improvements: - 30 days of autonomous flight - 100kg more cargo - 150kg of return cargo using VBK-Raduga