It takes about two minutes to settle, after which it will become the much darker color we all know and love. Then, the bartender will top off the pint before serving it to the customer. It is important that the settling pints be set in clear view of the customer, so that they can trust it was poured properly. Guinness actually sends minders to bars to ensure they are pouring their product correctly and they may lose their distribution if they are caught foul!