A while ago on here, I wrote that my preferred way to prepare coffee was to use a lot of it, but to steep it only briefly. After the four minutes of steeping that many people recommend, coffee can be bitter, I find.
Since I started using my Hario grinder, I've realised that I need to refine these rules. It all depends on how course is the ground. Most pre-ground coffee you buy is fine, and imparts the best part of its flavour very rapidly. Coarser grounds require lengthier steeping - but not four minutes. About 90 seconds should do it.