You are doing nothing wrong (or maybe running a binding in debug mode without testing if it runs fine normally ).
refreshTime is the interval the calendar gets downloaded. After download it will be reloaded and the time to the next change in the channels (that’s what this log message means) will be refreshed also. In this case the next event begins or the current ends at ~ 10:00 two days later (~20:40 + ~63,3h).