Thought I'd put this in context. I had the first 34 licences golded, then stopped doing licences with not even a bronze on the rest. There were some which I found hard... NB-3, IC-10 come to mind. I then went to do the Vettel challenges when I unlocked them. This took me about three weeks. I didn't play anything else. I play probably 3-4 hours every 3 days or so.... not sure how this time compares to others on the Vettel challenge. I then went back and started doing the licences again. In 1.5 hours I golded the 26 remaining licences. Vettel challenge is definitely more prestigous, but I like to have both because I don't think the Licences were easy as some people stated, I just think the first 30 were harder than the last 30