Most states do not have a specific limit on how many inspections can be done by a landlord yearly. Landlords are permitted to do multiple inspections per year as long as they are not done randomly and these inspections are not interfering with the tenant’s fair use of the property.
Most landlords do move-in and move-out rental inspections as well as one mid-term inspection. Some landlords also do seasonal or quarterly inspections, and specific inspections such as fire safety or pest safety inspections may be done in addition to these property inspections