You need to perform one hour of maintenance for every ten hours of intense artificial turf usage according to the The Journal of Sports Engineering and Technology. This study focuses on sports fields where “usage” means soccer and football players running on the field while wearing heavy footwear.
If the traffic on your synthetic grass isn’t that intense, the amount of time you spend on maintenance can be much shorter. Overall, the duration of maintenance depends on the traffic intensity. The frequency may be higher if you have pets or face extreme weather conditions.