I had one years ago that throve, which is amazing since I normally kill houseplants in short order. My ficus seemed to survive on benign neglect, perhaps aided by a lucky placement inside my house. I put the baby tree, an ill-advised present from a relative, in my large living room window (which faced west---not good probably) but behind a bamboo split shade so it got filtered light all day long. My son and I mostly hung out in the back of the house, so the front was kept a fairly even temperature most of the time. We lived in Calif.'s Bay Area so it only got really hot maybe one or two weeks a year. I DID have to walk by the plant twice a day which reminded me to water the poor thing sometimes but since I've been known to parch cactus, overwatering was not likely to happen.
The tree kept expanding. Eventually it lived in a 1/2 whiskey barrel and hit and then bent over on my 8' ceilings. When I moved, a friend refused to let me just abandon the plant. It's still surviving on her west-facing porch behind a rampant trumpet vine, which both shelters the ficus from hot, late afternoon sun, and protects it somewhat---I think---from drafts. She lives in a "banana-belt" part of town where the morning fog is not an issue.