When looking at Nitrous for a N/A street driven and stock motor I would look at maybe a 50-shot. Lots of Maxima guys in the day used that with little issue (done right). Some went as far as a 75-shot. They would also install a WOT switch so all they had to do is enable the system and put the pedal down.
Issues with nitrous are mentioned above. You also have to deal with charging and heating the bottle and a place to have the bottle in the first place (usually in the trunk).
FWIW, here is a pic of a Maxima after the bottle warmer did not turn off and over-heated the bottle
Here's another vehicle that burst while baking in the sun
I assume with the proper purge valves this would not happen, but, who knows.