Talk times seem quite short unless they are realistic vs hypothetical with others. Stand-by is ok:

Jolla:
Talk & stand-by time (approx.): 7.7/5.5hrs (GSM/3G) & 500hrs.

N9 (gsmarena)
Stand-by Up to 380 h (2G) / Up to 450 h (3G)
Talk time Up to 11 h (2G) / Up to 7 h (3G)

Lumia 720 (gsmarena)
Stand-by (2G) / Up to 520 h (3G)
Talk time Up to 23 h 20 min (2G) / Up to 13 h 20 min (3G)