Actually, the announcement reads 1 minute but its actually somewhat around 1 min 20 secs to 1 min 30 secs. And to clarify, you dont need to solve any captcha but now-a-days, the bot asks a question. The questions are too damn easy, they are like, "Whats the 3rd digit in the number 7728819 ?" and so on. But remember, you need to have wagered a minimum of 0.01 BTC from the address you are claiming the lotto.