three hours作为一个集体主语，需用单数动词。所以空格应该填is .
判断是否是集体主语的方法是看语境，在句子中是否是作为一个东西来应用。这个句子中等3个小时，这3个小时只是一个时间概念，可以看作一个整体，所以动词用单数。如果不是集体主语的话，应该就能从句子中看出第一个小时怎样，第二个小时怎样……...
2.Three hours （ ）not a long time.We can wait till they come
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