How many hours does it take male pollen to pollinate a female?

From when the polen grain lands on a WHITE pistil until fertilization of the seed ovule, takes between 20 and 30 minutes, maximum. Don't use bags, just use a paintbrush to apply the pollen by hand to a selection of buds. Best to do so in the evening when there is no wind. Remember to identify the different pollen types, I use different coloured (wire) pipe cleaners. The problem with bags is that when you remove them, pollen goes everywhere and you get random seeds everywhere too! If you do use bags, leave them in place for 3 full days before removing, this will kill any unused pollen and prevent random pollination/fertilization. Also, if using bags, they must be paper, plastic bags will cook anything inside them. Any holes in the bags will let pollen escape and cause unwanted fertilization. Bags also increase the risk of rot, another good reason not to use them, but if you do, place the bags over branches that are in the shade. After hand pollination with using a small paintbrush (my recommended method), you can spritz the pollinated buds with plain water to neutralize the pollen and stop unwanted pollination, I usually wait around one hour to be safe/sure pollination has been successful. After spritzing, the plants will be safe to put back into the grow room with the other plants. Just don't use pollen from hermies, otherwise you will end up with seeds with a genetic dominance for being hermies too, they WILL NOT be feminised! Seeds will take 4-5 weeks to ripen. When they are ready you will be able to see them as the calyxes will peel open to reveal the shiny brown seeds inside. Pollinate your females early, while they still have 100% white pistils, once there are brown pistils, fertilization rates/success will be reduced. One moderate branch 8-12 inches long with 10-12 tufts of budlets will give you anywhere between 50 and 300 seeds if all goes well. If you have a limited supply of pollen, it can be mixed one third pollen and two thirds (corn/rice) flour to extend it and you will still get 100% fertilization success as it only takes one pollen grain per pair of pistils to do the job. I have been using the paintbrush method, with the pollen and flour combination too, for 20+ years and recommend it with 100% confidence! Hope this helps, Organoman.