Set a timer and do 30 seconds work followed by 10 seconds rest for each exercise (not much more than it takes to get into position for the next exercise). (annesmiles.com)
A good start would be to try 30 seconds work time, followed by 1 minute rest. (ptinto.com)
If your clients is experienced with rope training and is sufficiently conditioned, combine 30 - to 35 - second work intervals with 15 - second rest intervals. (acefitness.org)