Does it happen that people get root canal treatment in an hour?

Yes: That depends upon the difficulty of the tooth, the particular conditions of the tooth, which tooth it is, and your dentist's preferences. It is not unusual to have rct done in one visit within that time frame.

Yes: Depends on the complexity of the required treatment and the skill, training and experience of the dentist.

Yes: Yes. Some even faster. However, some do take longer. Many times the slowest part of the root canal treatment sequence is the time required for irrigants to work inside the pulp canal spaces.