The typical recommendation is to wait at least four weeks between two coloring cycles. However, for people with lesser hair quality, that interval should be increased to six or seven weeks.
The general rule is to wait for a few weeks before coloring again, but there are some factors to consider. It is not wise to color weak and loosened hair often, because this poses a greater risk of damage. There is nothing wrong with coloring strong and healthy hair within shorter time periods. While even weak hair can sometimes survive frequent colorings, it is best to comply with the general rules.