I always give time estimates from the time you leave the gate area rather then when you actually land. Why? Well...it can take various times to get to the gate...I've been on planes that motored right on up to the gate..other times we sat there and waited for a gate to be opened.
If you want to base your time from the time you land, you need to add 15 mins to the times many here give you.
So...we usually find that an average of 70 mins, from gate to resort, is the time to plan on. The time can be as short as 45 mins, or as long as 90.
Here is a breakdown of my times, using DME...
Gate to tram...usually about 5 mins
Tram to terminal...1-8 mins
Tram to DME area...5-10 mins, depending on pace
Checkin....usually right around 2 mins, unless you need to go to the counter
Bus line....0-20 mins
On bus....0-20 mins
Ride to resort.....25-40 mins, depending on which stop you are.
So, you can see that your time can be anywhere from 40 mins to 105 mins. Most of my trips hover around 70, with one or two under an hour, and one at 85 mins. I've used DME about 10+ times to date.
Also, keep in mind when booking ADRs....you can experience flight delays...so don't plan for any ADRs too closely that day. I don't usually plan anything that is less than 6 hrs after I touch down!!! I've missed things due to flights being cancelled because of maintainence issues...landed 4 hrs late!!!