@Furetto, You can create a merged channel. See on the right side in the mapping details section there are tabs "single" or "multiple / merged". Select multiple and then you can add more than one guide to a channel and put times for which guide should be used.
This is what I did at first. My issue is that the times are not always clearly defines, as one of them is a sports channel that has irregular hours.
For a case like this, when you know for a fact that there cannot be any overlap in their broadcast but with vayring time-schedules, is it possible to have a solution different than duplicating the channel and thus having two separate entries.