Timing normally stores its data in the Library/Application Support/info.eurocomp.Timing2 directory of your user folder. There are also cases where it stores its data in Library/Application Support/info.eurocomp.Timing, Library/Application Support/info.eurocomp.Timing-lite, or Library/Application Support/info.eurocomp.Timing-setapp. The easiest way to reveal your database is by clicking this link and allowing it to open Timing.