¿Cómo se calculan las horas online?

How much time can I play?

According to the rules of the game, each player can play up to 20 hours per day (24 hours). For this matter, in the "Overview" section of the game you can find a counter, showing your play time for the day. The time is recorded each hour and 50 minutes (12:50, 13:50, 14:50 and so on). The game calculates your inactivity by minutes, and your presence by hours. This means that it doesn't matter if you played a whole hour between 12:50 and 13:50, or you have just logged in once trough this period - in both cases your playtime will be recorded as one hour. Our advice is when you see "Online: 19 hours" in the "Overview" menu, to stop playing immediately for at least 4 hours. Actually, when you see this sign, you have very little time period to stop your game and have a break. If the sign says "Online: 20 hours", this means that you already have broken the game rules and you will be punished.

Punishment

Maximum play hours for one day (24 hours) - 20. On the 18th and 19th hours the player receives a personal message with warning that he is close to the maximum playtime. After reaching the 20th hour, the account is being locked and for the next 6 hours the player remains punished with allowed attacks to him.

If you have logged 3-4 times for one hour, it sill counts for 1 play hour?

That's correct.
59 minutes in the account for 1 hour = 1 play hour.
1 minute in the account for 1 hour = 1 play hour.

To sum it up, for us it doesn't matter how much time you spend in your account as total, but how much you spend per one day (24 hours).