Hit Gold, how many games lost til demotion?

Title: Hit gold, how many games until I get demoted if I lose in a row? I'm not sure I can keep away from ranked, I started b5 why not grind out platinum in 2 weeks AMIRITE??! I just won with AD Leblanc, I can do anything (bought LB last night, wtf?) http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1614125325/31668401/eog Not just won, carried. Did I really grasp LB's mechanics that quick? HAPPY HALLOWEEN!