Distance is very important. The longer the putt travels on a specified green speed, the longer it is affected by that speed. Thus, more precise adjustments are required for longer putts than for shorter putts.
How to do it: Calculating in distance
Since successful putters have a backswing and follow-through of equal length, during the drills, note the length of the backswing you used to create a putt that rolls 12 feet.
Using this knowledge, it is possible to determine how far the length of the backswing must be for a given distance and how much it should be adjusted to putt another distance.
For example, if the backswing length we used in our putting drills to develop our standardized putting stroke for a 12 foot putt is 9 inches back, and we have an 18 foot putt on a green that is the same speed, the required backswing has to be more than 9 inches (probably closer to 14 inches) to accurately match that distance.
NOTE: The length of each backswing varies between individuals and personal styles. You need to DETERMINE YOUR PERSONAL PUTTING TEMPO (how quick you swing the putter back and through the ball) before learning different green speeds.
Putting it together: Combining speed and distance adjustments
First calculate the speed and note the difference from the "average" green speed.
Next, note your personal putting tempo. Learn your personal "tick-tock" pace you use when swinging the putter and use it consistently every time you putt, only adjusting the backswing length for different distances and green speeds.
Third, note the backswing length listed on your Backswing Card for the standard 12-foot putt.
Finally, combine the calculations to estimate a backswing length to use that compensates for both the current lie (distance) and green speed. Practice and adjust until you have determined the backswing length for the new speed and distance.
The final adjustment to learn how to compensate for is the slope of a golf green.