Ilya Ilin’s Time Index Ratios
Snatch 191k

Pull extension: .67 seconds
Receiving the weight: .33 seconds
Clean & Jerk 246k WR

Full extension: .67 seconds
Receiving the weight: .33 seconds
From the platform to standing up: 2 seconds
From the platform to lock-out: 3.7 seconds
Jerk from dip to lock-out: .47 seconds
290k Front Squat @ 1.2 seconds

Equivalent clean & jerk: 241k

Notice the elbows stay up during the downward and upward motion and in the same position as he will begin his jerk. A function of the front squat is to set the lifter up for the jerk, not just for standing up with the weight, i.e., when the weight is racked the lifer should be in the correct position to jerk the weight from that point.
The claim can be made that the vast majority of top lifter’s in the world train their squats at 1 second or faster for a vast majority of the time. I have seen very few videos to dispute such a claim. Of course there will always be the exception, but for the most part those exceptions are based on those top lifters doing more than they thought they could do without decelerating. Remember it is all about non deceleration, not expressly the 1 second time in motion. The 1 second seems to fit the bill for non deceleration, because with a slower drive out of the bottom the lifter can continue to accelerate and achieve a squat in 1.5 seconds without decelerating through the lift. Ilya’s 290k front squat in 1.2 seconds is a good example of this. However had he tried 295k the time in motion might have dropped off exponentially to as slow as 2 seconds. This is why it is extremely important for lifters to know their capabilities so they know when they are beginning to decelerate and stop at that point or actually before reaching that point.

Top speed during a snatch or clean pull to full extension can be reached at different points over the trajectory of the lift. Continuous accelerated velocity would place the top speed at the point of full extension or from 0 to x m/s, x being the top speed/force reached during the pull. If the lifter always achieves .67 seconds in the pull to full extension that criteria of top speed will be met at the right transitional points, because it must. If the pull to full extension to receiving the weight is a 2:1 ratio that means the lift should be a smooth transitional lift from start to receiving the weight. If not it could mean the lifter will not lift as much as they are potentially capable of or the lift will be missed. This is true in cases where maximal velocity is being applied or the 1st pull mechanics is controlled by moving slower in order to advantage the 2nd pull, although this is rarely the case among top lifters.