A simple Stopwatch program which continuously reads the console.log and starts a Stopwatch.
You have to press a key in-game to start the Stopwatch. It automatically resets after 45 seconds.
Add '-condebug' in your CS:GO launch options (Steam -> Library -> CS:GO -> Properties -> Set Launch Options...)
Bind a key which echos 'START BOMB TIMER' e.g.: bind "C" "echo START BOMB TIMER"
bind "V" "echo RESET BOMB TIMER"
echo "TOGGLE BOMB TIMER" to toggle between 40 (default) and 35 seconds.