The number of casinos you can visit will depend on the number of days you stay in the city and also on your intention to take advantage of them. Get to know the main casinos in the city, leaving options that fit your profile.
Visiting Las Vegas and not knowing your fancy and luxurious casinos is like going to Miami and not knowing the beach! It is not living the experience completely. Even without the intention of playing, it is worth knowing the environment and feel the energy of the bettors.