depends on which way you’re going to go up it.
The Classic way and TDF route is from Bédoin, this is steep, mainly 10-12% all the way and will take at least 1:15 and for most around 2hrs+ It’ll be hot too, I went up last week and it was 37.5deg in the shade.
The road up from Malaucène is similar if not a bit steeper but possibly a bit shorter. This is where Guy Martin filmed the speed attempt downhill so give you some idea how steep it is.
The road up from Sault is much easier but 10km longer than the other 2 at 30km/ish but mostly only 3,4 and 6% gradient until the hotel for the last 6km then it’s 10-16%.
Threshold efforts is where it’s gonna be, that and throwing a big gear over as it’s a grind for most.