Which of the following sentences is correct? He left for America after a Three Days state visit. Or He left for America after a three-day state visit. The first sentence is correct. The words day, month, minute, mile, etc. are usually singular when used with a number immediately before a noun. Here are a few more examples: • Every day he goes for a twenty-minute jog. • Every day he jogs for twenty minutes. • Last year he ran the twenty six-mile marathon. COURTESY : The Hindu (The National News-Paper) - India