OK, hexathlon's md are over and it was the first time automatic check-in (as I know) was used.
So, we are waiting...
I got my MD count go up by 1 this morning (2 March). So medals should be in.
How long should we wait if the Mission Day attendance count does not increase?
[Found answer, 24-48 hours]
Where is best place to inquire if it does not?
[Ingress support case]