if you read the stuff that accompanies the chart and data (sources, etc), you'll see that the maximum time limit is the exact same, or however long it takes the

if you read the stuff that accompanies the chart and data (sources, etc), you'll see that the maximum time limit is the exact same, or however long it takes the police to reasonably investigate an incident. however, if you're not formally arrested, you're not allowed to be kept unwillingly. if you ask to leave, they must either let you go, or formally arrest you. or, if they ask you to stay and you say yes, they can do whatever, up to the max time period.