Dual-booting Linux (Fedora)

I recently bought the Acer Chromebook Spin 714 [CP714-1WN/2WN] with a 256 GB drive, and I am trying to dual-boot Fedora onto it without needing to have my flash drive plugged in.

I am using CRAP, and it is telling me to resize the ChromeOS data partition, but I have no idea what size I should size it down to. Is someone able to help with that?

P.S I am using RW Legacy

your ChromeOS userdata partition needs to be reduced by the amount you want to allocate for the Linux install. So (as an example), if you have a 100GB userdata partition and you want to allocate 40GB for Linux, you would resize the CrOS userdata partition to 60GB.