Well, it's complicated, but maybe 25 years. Here's a reference that's totally on point: http://mstl.atl.calpoly.edu/~bklofas/Presentations/DevelopersWorkshop2

Well, it's complicated, but maybe 25 years. Here's a reference that's totally on point: http://mstl.atl.calpoly.edu/~bklofas/Presentations/DevelopersWorkshop2011/8_Leveque_Orbital_Decay.pdf http://mstl.atl.calpoly.edu/~bklofas/Presentations/Developer... "An Evaluation of CubeSat Orbital Decay" - everything you wanted to know (and more!) about the topic.