ImaTato said:They "see" the sun for only 8-9 hours a day.
This is likely a physical impossibility given the days are only 10 hours long, and even a perfect southerly exposure will still have objects on the horizon that block the sun at the beginning and the end of the day. The sun only gets a third of the way to vertical (at these latitudes) at this time of year. A much more reasonable guess would be 4-6 hours for a bright southerly exposure like ours (with only ocean on the horizon for most of the day at this time of year). I would caution against assuming how much light an indoor plant gets without observing the actual times when sun hits the plant over the course of a day, and how that changes with the seasons.
If an indoor plant like the one pictured can actually "see" the sun (documented line of sight contact, no curtain or blinds in the way) for 4 hours a day, weather permitting, that should be more than enough to keep it perfectly happy at your latitude.
