Hi there! I'm afraid we don't track how long each students spends doing one activity.

Here are some help articles to learn what you can track and follow:

https://help.openlearning.com/t/18rnzq/what-are-ol-analytics-and-how-do-i-use-them

https://help.openlearning.com/t/365w1v/what-information-can-be-exported-and-from-where