Roots are the real enemy. Hair grows about 1–1.5 cm a month, so most people with an all-over blonde need a root touch-up every 4–8 weeks, and closer to 4–6 if their natural colour is dark, because the contrast shows sooner. Toner is the other half of the job. It fades and the brass creeps in, so a toner or gloss every 4–6 weeks, plus purple shampoo once or twice a week, keeps it cool rather than turning orange. Bleach only the regrowth, never the full length again, because overlapping bleach is how blondes end up snapping. If that schedule sounds exhausting, balayage or a "lived-in" blonde with a softer root can stretch to every 3–4 months.