The product information says this shampoo fits well into a regular grooming regimen for short, medium or longer men's hair, but it does not specify a fixed frequency. That is because the right schedule depends on your scalp type, hair texture, sweat levels, styling product use and even how hard your water is.
If your scalp is oily, you work out regularly or you live in a humid environment, you may prefer washing every day or every other day. If your scalp is drier or your lengths already feel rough, washing two or three times a week may be enough to avoid stripping natural oils. Pay attention to how your scalp and hair feel after washing: if strands feel tight, squeaky or brittle, that suggests you should wash less often or add a conditioner. If roots feel greasy by the afternoon, more frequent washing may be more comfortable for you.
It is also fine to change frequency by season. In hot, humid months you may need more washes; in winter, less. If you use styling products such as wax, clay or oils, massage the shampoo into the roots thoroughly and rinse completely, because leftover residue can make hair fall flat again — the opposite of what this shampoo is meant to achieve.