a matter of days, miles, pounds, etc.

a matter of ˈdays, ˈmiles, ˈpounds, etc.

a particular number of days, miles, etc., especially when this number is small: Don’t worry, it’ll only be a matter of hours before he gets back.It will only cost us a matter of a few pounds.Travelling by boat could take us a matter of weeks.
See also: matter, of