. How much time would you estimate it would take to convert your card system to a computerized database? :-)
But why? What benefit would be served? Not everything has to be done in bits & bytes. Sometimes pencil & paper, or post-its, or scribbles on a whiteboard, are the best tools for the job. In this case, having to go into a computer to enter the information probably DECREASES the likelihood that the data will be captured.
This time tracking task is not necessarily a nail for the computer hammer.