It's very difficult for me, used to the weaker sunlight in NJ, to give sun intensity advice for Florida and other southern gardeners, but I'll give it a try.
Avocado is said to sun scald easily. The younger seedlings certainly are quite able to manage with just weak and limited winter sun in NJ homes. So it's possible that in Florida, young avocados might be able to manage without direct sunlight at all... or not.
I keep my avocados clustered around a SSE window but give them supplemental lights from both sides with clamp on utility lights fitted with 100W equiv. daylight CFL bulbs. The lights are turned on when I wake up and turned off when I go to bed. BTW, I mist them thoroughly (dripping) every morning.
However, this winter, I had an extra one that didn't fit and that one was kept in a NNW window -- no direct sun at all during the depth of the winter. Now, with the sun coming around more to the north, it gets about 1 hour of westering sun. It is spindly and has much weaker growth compared to the more properly cared-for plants, but it is managing to survive.
When the outside night time low temp warms up to 45+Ã‚ÂºF, I gradually acclimate the avocados to longer sun exposure, eventually placing them where they get direct sun from sun up to sun down EXCEPT a couple of hours of the noon day sun.
In the fall, I bring them back inside when the minimum night time temp falls below 42Ã‚ÂºF, before they go dormant and lose their leaves. But this probably would not be an issue for you in Florida.