You are more than welcome to attend the entire inspection. However, please be aware that different Realtor groups have varying policies.
In Moscow and Pullman, there are currently no restrictions on attending.
In the Lewis-Clark valley, the MLS has established rules that either the agent must attend with the customer or permission must be granted by the seller of the property for you to attend. Please consult with your representative to make arrangements for attending.
I do have a policy that you if you do not attend the entire inspection that you arrive for the last 30 minutes. I have a process for inspection that accommodates having the customer there the entire time and at the end, but not for interruptions in the middle of the inspection.