For the Make!Science examples in this menu area, we have provided some elaborate Scratch programs for data collection and display. But it's very easy to use just a few Scratch blocks to do timing of events with the Make!Sense board.
Here's an example in which the "b" key starts a timer, and the "a" key stops it and displays the elapsed time. This would work with the orange IR reflection sensor connected to Channel 0 in the standard keystroke settings. Make sure the board has the steady green LED light when you try this. Modify the "When ___ key pressed" Scratch blocks accordingly if you are using different sensors.
The Orange IR reflection sensor operates a bit differently from other sensors in that it is "high" when it sees nothing, and "low" when it sees an object. So "b" is "start timing" in this case. For other sensors there may be a different response. You can always test using a text editor to display the resultant keystrokes, or use a "say" in Scratch to view them while the sensor is sensing an object or condition. The "configurator" is also a very good way to get a picture of the sensor values and mappings.