no one seems to actually know how long a cycle is in metroid so i did my best to figure it out
all of this info comes from metroid prime 2 because it has a lot of events very close together that we can find in the pirate logs. before we start it's also important to note that the cycle dates correspond with the start of the operation; "cycle 1" on a log is not the first cycle of the calendar, but the first cycle of the mission to aether. but with that out of the way, we can jump to...
this immediately tells us that the time between the federation landing and samus's arrival is around 8 days. pirate log 07.013.6 says...
"Another disaster. The transport bringing our reinforcements and supplies has been shot down. It was engaged in orbit by a federation vessel, which has landed near the alien temple."
obviously referring to the federation ship that samus lost contact with, which is right next to the luminoth temple area. log 07.159.9 is...
"Another hunter, wearing the traditional colors of Samus Aran, made planetfall today. Horrific as it may sound, there are two of them now."
the pirates used to think dark samus was normal samus; this is when they find regular samus actually shows up. it's pretty safe to assume the ".013" and ".159" refer to thousandths of a cycle, so we know it was 0.1463 cycles between the pirates recording each event. this obviously isn't a perfect system, but it's better than nothing. 0.1463 cycles is about 8 days, so we can just do 0.1463/8 to find that one day is 0.0182 cycles, and one cycle is just about 54.68 days!




















