Yep I'm jealous also, since I'm only at about 3 acres and planting more all the time, but 25 acres??!! Yeah you bet you're feeling overworked. I've heard it takes about 1 laborer (or bananero) per hectare (2.5 acres). So we are over that amount here, but our expansion being what it is I'm glad to train the extra hands. We also don't have a "money partner" so our expansion is slow.
As far as harvesting, at least for our varieties here, we look for the "corners" of the fruit to disappear. For example, all of the young fruits will have distinct squarish corners to them until they fill out sufficiently to harvest "green." As stated earlier by
jeffreyp and
bananimal, you want them to get plump, then cut them off above the fruit for dehanding. We cut off the flower with male buds as soon as they've gone 3 dead hands below the fruit, and mark the date (week number) right on the plant, on the peduncle above the fruit & on the stalk as well as putting a colored marker on the bag if you're using those. This way, if you have uniform growing conditions, they will all take the same number of weeks to mature or advance to the state where you want to harvest them. We go out weekly to do this process; cutting flowers, bagging and marking the plant of each bunch that's reached this point. Our field has some flat areas, and some places that slope down to a creek, so we tend to get a little differentiation; the ones nearest the creek seem to be the biggest plants, I guess from getting the most run-off topsoil and other nutrients.
I am not familiar with Orinocos, so I'm not the best judge of that particular variety, but I will comment this way: the photos that Abnshrek put up the link for, show what I call "corners," and none of what we harvest around here for commercial purposes would be mature enough yet, looking like that. For a good idea of what we look for as far as plumpness, here's some of our Senoritas that are
really "there":
SENORITA
The fingers at the center show lines of where the "corners" used to be, but those babies have really filled out to their sweetest potential without splitting and there's nothing other than that hint that there used to be a corner there. I hope this helps some, and don't hesitate to ask more questions. I've only been at growing naners a couple of years now here, I'm no expert by any means, but I've been learning as fast as I can. Have you seen the videos put out by Dr. Nelson from Hawaii? He's a member on here and has posted his videos on YouTube here:
These are
immensely helpful as well as being exceptionally informational; I've viewed it numerous times.