I am creating a site for a client. The requirement of the client is as follows:

They want a website for booking consultations based on number of hours.
The employee is themself and currently there is only one location so I don't want to mention employee and location in the appointment form. 
Coming to the next part, the consultation sessions can be 1/2/3/4/5 hours long. I have read the support forum and I understand that the plugin right now doesn't allow for having custom hour booking on the front end.

So, my question to you is if I make 5 different services : 1h consultation, 2h consultation and so on...and then allot time slots in the day, the purpose would be achieved. However, what would happen if one customer books 1h slot from 12-1 pm and another customer books a 3h slot from 11am-2pm ? Will the system accept both ?( since the service type is same) Or will the system see if the "employee" (which in my case is the client, is available or not...)

Please answer this question asap.