please do advise how the working hours for the teacher in the language school are calculated? a part time & full time experience
Take the number of hours you worked per week, multiply by the number of weeks and divide by 37.5. Then divide by 52. This will give you number of equivalent full time years.
BUT full time teachers don't teach 40hours per week. They teach maybe 6 hours (like at my university). So I would think another way to do it is to look at how many hours were you paid for. I read about a guy in this forum, who was paid for something like 15 hours per week, but his teaching time was only 3 hours per week. In that case, I would use 15hours and multiply by the number of weeks and divide by 37.5. Then divide by 52. This will give you number of equivalent full time years.
BUT in your case, you might be paid say 6hours and expected to teach for 6 hours per week and the institution knows that you will spend other time preparing the teaching material so they pay you at a higher rate. Well, in that case. Look at what the full time teaching hours time per week of a full-time person is and compare that to yours.
I am really no expert so what do others think?
Notice that in some countries you're not paid "per hour". In my country, for example, you will not find any job ad informing the pay per hour. It's always per month. The minimum wage is also set for a "full-time job", and not "per hour".
But you answer your question: you count what your contract stipulates. If your contract says you work 6 hours per week (regardless of how many hours you spend preparing), then you count 6 hours per week; if your contract is 15 hours per week (say, 5 teaching, 10 preparing and correcting lessons and exams), then you count 15 hours per week.
Remember that a full-time teacher may only spend a few hours per week teaching, but his contract also expects him to conduct research, carry out administrative tasks, prepare lessons, etc. (as you can see in the NOC list of duties).