URC3640, URC3660: How many channels can I program per Channel Shortcut key on my Essential remote?

Each of the coloured Channel Shortcut keys can be programmed with up to 8 different channel numbers.

The maximum key pressed for each channel is 6. Please check the following article for the programming procedure of the Channel Shortcut keys.

Related article:
URC3640, URC3660: How do I program the Channel Shortcut keys on my Essential remote?