Skroutz - It will only be a reduction of sim hours assuming that the sim you're using is an FNPT (II). An FNPT (G) or FNPT (I) can only be used for a maximum of 20 and 25 hours respectively. If you're not using an FNPT (II) it will be 12 hours of aircraft flying, and if you are using an FNPT (II), I don't think you could get one on an hourly rate for much less than £200 - so it does help a lot.