With the regulars solution the client will see instant color due to the cosmetic bronzer however the actual tan takes 9-12 hours to fully develop. With the regular tan option you cannot sweat or get wet until that time or you risk washing off the spray tan!
With the rapid tan option they will rinse in 1-4 hours (determined by the spray tan professional) but full color still takes up to 12 hours develop and color for both will continue to darken over the next 24 hours.
For more info on how a rapid tan works please click here https://perfectglowsunless.com/product-information/#qe-faq-804