I dont have the normal minecraft.exe as i cant access it and instead use the Technic Launcher. How do i install the timer :P

You can try using the other minecraft timer. That's the one I use, it's external. How it works is whenever you pause (pressing escape) it updates the timer. It also updates the time every so often normally. Just use that and pause as soon as you finish and it should update. It also keeps time between save and quits. This is the timer by CBenni.

https://mega.nz/#!PgRA0DoD!FY1PWCS7EHLtPmASh_7KyOVQpLVPXeWkn-zcGYAekxU

thanks :D