How long should a table tennis drill last?

For Intensity 

Three-to-four-minute table tennis drills are a great way to improve your game. They encourage intensity while keeping the ultimate focus on technique, and they’re a good way to get started with training.

For Intensity & Consistency 

7-minute drills are great for a balance of consistency and intensity. European coaches prefer them because they’re great for practising your technique and helping you learn to move quickly without sacrificing form.

Endurance & Consistency 

15-minute drills are preferred by Asian coaches where the focus is on consistency and most of all stamina. These longer drills will test the player mentally and no doubt build endurance.