如何用英语表达：分3次进行 每次间隔5分钟

Three periods of time are needed to do the job,and five minutes is needed for each period,with an interval of five minutes.（或者with five minutes in between.）
由于没有上下文,我不知道“进行的”是什么,但是我这种译法应该在什么情况下都适用.注意：five minutes is needed中,主语five minutes属于单数概念,表示一段时间,不要用复数；而Three periods of time则属于复数,因为这里强调时间的三个段.如果想要简单扼要的表达法,就用Three periods of time are needed to do the job,five minutes for each,with a 5-minute interval.

5 minutes each time in 3 runs, at intervals of 5 minutes.

Three times on a five minute intervals for 5 minutes

the procedure consists of three operations, each lasts 5 minutes at an interval of another 5 minutes

It will run three times, five minutes for each time with five-minute interval.