There's no universal answer. The right interval depends on the cut. Here's the honest schedule we give SIR clients for each style.
Buzz / short taper
Every 2 to 3 weeks. The shorter the cut, the more visible the regrowth. If you want it sharp, plan accordingly.
Textured crop
Every 4 to 5 weeks. The shape holds well into the fifth week if the bulk was handled properly at the cut.
Side part / mid-length
Every 5 to 6 weeks. Long enough that you don't feel rushed, short enough that the part doesn't get lazy.
Flow / longer styles
Every 6 to 8 weeks for a shape-up. The cut isn't about length removal — it's about keeping the ends clean and the silhouette intact.
Beard sculpt
Every 3 to 4 weeks, ideally paired with your haircut. The neckline and cheek line drift fast.
—SIR Management