Well, I decided to turn it on. I got two of these last year (one holds 50, one holds 100) and finally getting around to turning the big one on. My fiance replaced everything on it, I just have a couple of questions. How long does one typically take to heat up? When I got it, it has ventilation holes (four about the same size as on a styrofoam incubator and two smaller), how many do I leave open and what can I use to block the holes, would tape work? There is a little, what I think is supposed to be light on the top, the unit is heating up but the light is not coming on. Any ideas? I am going to be sitting here keeping an eye on this and wont leave it on if I have to leave the room. Any suggestions would be appreciated, I have worked with the 50 egg unit,(it did well) but still dont know much about these old incubators.