If your plane arrives, ontime, at 6:30, you will most likely be off the plane by 6:45ish...the time the plane lands is not the time you are walking out the gateway. The average time, from gate to resort checkin, is about 70 mins. BUT...I am seeing more and more reports of longer times to CR/BLT since it is usually the last stop on the route. I would plan on arriving at BLT by 8, not much sooner. I never make any ADRs, even at my resort, within 3 hrs of my landing time...just too many variables.
Even if you had a car service pick you up, and you had no bags to get, it would still take you about 50 mins...so that would be almost the time you have your ADR for. Way too much stress for me.