You can check these folders as often as necessary — once every few days, for example.

有需要的话你可以经常检查这些文件夹，比如，一天一次。

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After the tree saplings were planted, the planter would come over to water them once every few days.

树苗栽种之后，种植人每隔几天就给他们浇水、灌溉。

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Negative-pressure therapy decreases the need to change wound dressings from one to three times per day to once every few days, a major benefit when medical staff is in short supply.

负压疗法降低了频繁给伤口换绷带的需要，从之前每天换1到3次降低到几天才换一次；在医护人员紧缺的时候，这会起到很大的作用。

youdao

If you do have to look at polls, you should do it no more than once every few days, to get a general sense of the state of the race.

FORBES: Thoughts On The 2012 Presidential Election

Now here's a real head-scratcher -- imagine that instead of having Netflix ship you a new movie on disc every few days, you had some other company sending you a new hard drive once or twice a week.

ENGADGET: SIM2 tag-teams with Entertainment Experience to bring you movies on hard drives