I am a green card holder and I want to get married, How long does it take for the form I-130 to be finalized and for a spouse to be able to come here?

I am a green card holder and have 4 more years until I can become a U.S citizen. I would like to get married and have my Russian girlfriend come to the US. I have read that one can apply for an I-130 form to have a spouse immigrate to the states. My girlfriend has a 3 year tourist visa. I would like to know how long does it take for the form I-130 to be finalized and for a spouse to be able to come here. I have seen that it can take as little as 5 months and as much as more than 2 years. Also, I would like to know if starting the process will prevent my girlfriend from entering the U.S on a tourist visa or on any other type of visa.