No, this is a violation of current legislation. I note without references to the Labor Code of the Russian Federation, it is allowed to work 8 hours a shift, and with the consent of the employee, a maximum of 4 more hours is possible, in total 12 hours.
There is a chance to get a real aversion to work with a similar alignment of affairs. My first job didn't have such a schedule, but I was terribly annoyed by the routine. This made the work seem difficult, although in reality it was not. And it was the routine that made me leave there.
Later, I found out that I was waiting for a possible increase :)
18 years is the time of obtaining higher / secondary vocational education and, most likely, the offered good salary will not bring more benefit than training (at least for the sake of a crust) at this age.
According to the work schedule, 14 2/2 hours will be difficult, because most likely the work will not assume a measured rhythm, given the age of the author.
And one more aspect, if the author is still going to develop in the chosen area, then work experience will certainly be an advantage .
In my opinion, this is the most difficult work schedule. And it usually doesn't count public holidays / weekends. That is, if the shift falls on January 1, then you will work on January 1. Are you ready for this, especially if you haven't worked anywhere before? But if a high salary is a good motivation for you, then why not.
Is this normal ???