In this task, we ask you to write an answer to a question that involves “event duration", based on a given sentence. Here, event duration is defined as the understanding of how long events typically last. For example, “brushing teeth”, usually takes a few minutes. Note that a lot of the questions could have more than one correct answer. We only need a single most-likely answer. Please try to keep your "answer" as simple as possible. Concise and simple "answer" is preferred over those complex and verbose ones.

Sentence: The legitimization of gambling led to its increased legalization across the US. 
Question: How long did it take to legitimize gambling?
10 years.

Sentence: During a blackout , the house is attacked by aliens , who had previously killed Joe and abducted Iris . 
Question: How long does a blackout last?
for three hours.

Sentence: On London's Stock Exchange, Reuters shares rose five pence to 913 pence ($14.43). 
Question: How long is the stock exchange open?

it's open for 8 hours a day.

