Weeks in the best case, months more usually.
Of course Millette could find himself a pay-to-publish journal, that would speed things up to he time it takes for a cheque to clear
See, it took him a few weeks to get to preliminary results and some raw data.
Writing the proper report will take some time.
He'll maybe want to have it internally reviewed before submitting to a journal.
Journals will have to read it, understand it, find peer-reviewers.
Peer-reviewers usually don't sit around idle just waiting for something to be peer-reviewed - they will take their time.
If they have recommendations to pass back to Millette, give him a couple of weeks to work them into the report and re-submit.
Once peer-reviewers give the go-ahead, journal editors need to find a slot in their journal; some publish monthly, some bi-monthly, some every quarter. So that may delay it another 1-3 months.