how long take casion to spot a card counter?

hi everyone...im new to this card counting system... just wondering if i going to casino with bank roll of 30k,, while spreading $50-$500 bets, and i will leave casino soon im up about 2k... how long usally would take them to find out? are the floor person the one that spotted the card counter the most time, then call the pit to check camera? or mostly card counter got caught by the eyes in sky?