Completed the 4 challenges yesterday for the blackjack merit, i 100% completed them saw the "you have won" screen and crossed them off one by one. Insurance challange was a little different that it displayed itself in the top left as "you have won insurance bet".
Anyway i did this yesterday so it will be 24 hours today sometime. And i did them all quiet quickly and close together so they should be easy to find. i thought it odd the merit would take so long, it used to take long but lately they have been quick.