How change time units on 'blocks'?

Hi. Bad writing in English, assisted by the google translator.

I want to make a plan of courses of study. We have lectures in hourly blocks, for examle: 1-st block 8:00-8:45, 2-nd block 8:50-9:35 etc. I want to show the number of hours the unit blocks. In addition, he wants to set an event, choose not the time, only the blocks number for example: 1-2 next option: 3-4, 5-6 etc.

I would ask for a hint.
Piotr (Peter).

Unfortunately there is no easy way to achieve such task. Current version can use only hours as time blocks and will not allow custom time-scale, with custom time blocks.

We will consider creation of optional extension for such task.