Can confirm for Jolla C.
The first days with really heavy usage and curious testing still got me through a whole working day with 10% alarm going off in the early evenings.

Yesterday, normal usage i guess, bluetooth, wifi, data always on, some browsing, some 10 phone calls, some hours of music playback with display off, some minutes of navigation and i still had ~40% wenn going to bed.
Ah yes, and i finally got bored from Pokemon go and deinstalled, makes a difference.