@pottla woah - 60hrs is extreme...
I migrated from an old myBB forum to NOdeBB, and it took waaaaaaay less than that.

It was less than simple too, I had to set up a droplet on Digital Ocean as an intermediate forum so I could migrate my data across.

MyBB (mySQL database on my VPS) -> Mongo(Digital Ocean)
Mongo -> Postgres(Digital Ocean)

then import from DigitalOcean to my own VPS
I also needed to install postgres etc on my own server, and I themed my forum.