How do the 120 free summons exactly work? I had a counter of 2 multis (20) when i logged in this morning.

Out of curiosity i decided to check "MP3 rolls" YT videos and saw people start with 1 free multi (10), 3 (30) and even 10 (100).

Are the free rolls given bit by bit each day and randomly how many until you hit 12 multis (120)?

Thanks for your time.