Is this enough hours of a direct sunshine for outdoor(terrace) flowering?

I have dilemma, I'm growing outdoors, well not quite, on terrace.
I'm trying to find out if the light outside will be enough for 12 hours of flowering.
And now, of course if I had sun shining on my terrace all day long I wouldn't ask.

I'm thinking of taking plant from darkness at 8am(which is already light, sunrise is at 7am) and let her stay outside. But the problem is that the sun starts to shine on terrace only from 3pm until sunset which is around 9pm, so I could cover it again at 8pm. I live in a block of flats which face west and for the morning hours, sun is behind the building, so after 3 pm sun goes in front of the building and starts to shine on my terrace.
Terrace is on 14 floor so there is no other obstacles or shades.

And my question is: would it be better to keep the plants under lights during "non sunny" hours or will it be OK outdoors? Will there be enough of lumen's for this short period of time?
I have clear blue sky almost every day so I don't have to worry about the clouds.
So there would be about 5 hours of direct sunshine and the 7 hours of clear blue sky.
Temperatures are between 22 and 28 Celsius (72 and 82 Fahrenheit).

And the other thing is, should I turn plant every other hour to catch as much light possible or leave it in one position all day and turn it next day to not stress her?

Thanks