Edited sentence: 6 hours, 30 minutes (planned).After the new tank is installed, the old one will be stowed in the shuttle for its return to Earth.EVA 1.EVA 2.EVA 3.Each spacewalk is planned to last approximately 6.5 hours.End (UTC).John D.Olivas  Christer Fuglesang.Olivas  Fuglesang.Olivas Nicole Stott.Prepare for the arrival of the Tranquility node by attaching cables between the starboard truss and the Unity node, the area where Tranquility will be installed.Prepare for the replacement of an empty ammonia tank on the station’s port truss, or backbone, by releasing its bolts.Remove the new ammonia tank from the shuttle’s payload bay and replace it with the used tank on the station.Start (UTC).The new tank, weighing about 1,800 pounds, is the most mass ever moved around by spacewalking astronauts.The spacewalkers also will replace a communications sensor device, install two new GPS antennas and a new circuit breaker.They also will retrieve a materials processing experiment and a European science experiment mounted outside the Columbus laboratory and stow them in Discovery’s cargo bay for their return to Earth.Tranquility is targeted to arrive to the station on STS-130 in February 2010.With this spacewalk Fuglesang will become the ESA astronaut with most spacewalks to date (four).flight day 5xx:xx.flight day 7xx:xx.flight day 9xx:xx