The time period between B and C was around 36 hours in real time, but because Sigma and I were jumping between different possible realities, sometimes together and sometimes separate, it was a lot longer between them for us than that.

Then at C, Akane explains all this, then jumps at Sigma and I to get our psyches back to 2029, at point D. I get put into cold sleep so I'm still young on the moon, and Sigma spends half a century becoming a multidisciplinary scientist so that project can actually be run.