sick leave

Q: Our office says that we have 22 paid leaves in a year, and we can utilize them in any case of emergency. But if there are no emergencies then you cannot take a leave, and after a year if there are some leaves left they will be wasted, because we didnt utilized them.

At the end of the year if we did not fall sick or needed any emergency then our leaves are wasted. My problem is that I spend 9 hours in the office and remaining few hours in home, do the normal stuff like prayer, eating, house things, so I have very less time for Quran studies and Arabic studies. I have started it but the progress is slow and I want to do more but time is not there.

So now I cant take leave saying that I want to learn Quran or Arabic, I will have to fall sick or any emergency, or else it will be a lie, but I know each minute is important, I want to use this time in a good way, Allah is my top priority not the job, so how can I use those 22 leaves for a better purpose, compared to doing stuff at office.

Can I lie to my boss that I am sick and then I study and learn Islam all day, is that right?