每天 every day
一个月二次 twice every month
一天三次 three times a day / three times every day
一年一次 once every year / once a year
一天一到二次 once or twice every day / once or twice a day
一个星期三四次 three or four times every week / three or four times a week
多久一次 how often
……结果 result of