Calculated gap days? What are you talking about?But according to your posts, you're relying on his progress report, and this time his progress report clearly implies he had been working on weekends. Moreover, why didn't you take weekends off of the "gap days" you calculated? make it 10-12 days off instead of 14?
Are you talking about the vacation time?
Looks like I have to be even more precise: I'm talking about mandatory vacation time your employer has to give you in some countries. For example in Germany that time is 20 days in a year and only work days count for those 20 days.
And to be even more precise I've compared people with a normal 40 hours per week job with 20 vacations days a year with L&P and his most likely below 40 hours a week job and most likely much more vacation days per year.