It was definitely a minimum 16 hour JOC to apply last year, so I can only imagine it will be the same this time around, but you never know.
I trained at Multiflight with JOC completed at Oxford and still not had any luck with Jet2. If there's any sort of agreement with Multiflight I've yet to hear about it. I'm also a local so I don't think that has any sway on their selection process either, despite what I've read in other threads.