it was the first 3 months!

maybe they calculated 90 days...

I reached it already within the first month, thats why I checked with the support, and told me that everybody should receive the bonus by end of march

update:
it looks like that you can transfer from MR to Miles&More only 10k max per transaction!

for me, it only works with Firefox browser
I contacted the support for transfer 50k MR to MM
lets see when this will be credited to MM