I've been doing it from cars to bikes for many years. But only on the cars did I use the nitrous all the way till the shift. For example; My 81 VW rabbit with a T4 turbo, I used a 40hp shot. This pushed the car to 400hp. On bikes, I only use it to help spool time if/when running on the street for those occassional street jousts and only if the turbo is on the big side. Plus I am a big guy and I live at 5300' altitude. No power when out of boost.
I don't use a lot and not for very long. On my Busa, when I get around to putting on the new turbo unit on, it will have nitrous on it for the spool. Since I have the ECU editor for the stock injectors and the MS for the secondaries, it will be seamless and very effective. I'll have the nitrous enabled at around 3.5k to 5k.
FYI, you only need a small shot to give a nice hit. For one you will get intercooling effects by itself and the rest is HP anyway. I've won a lot of low speed races this way.