The pay for register a class in italki
I saw the left of information of each teacher will have the cost we have to pay, but this cost is only for 30' or it uses for 30' per day in a month?

Question

Answer

The price for each teacher is for one hour. You and the teacher will speak to each other using skype.

Answer

To add to Andi's answer, you pay for each lesson. The price listed is generally for 1 hour, but some teachers will have the option of taking  30 minute or 45 minute lesson, which are, of course, cheaper than the 1 hour lessons that any given teacher may offer.

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