Is there any restriction on number of amazon posts to be posted?

There is no limit to how often you can post. However, the recommendations are adding content frequently, at a rate that is comparable to that of any social network you may be using. Additionally, cross-posting your products on a variety of social media sites and Amazon is a terrific approach to increase brand visibility.

No, there is no restriction on amazon posts, its better you just go with 3-5 average posts daily.

Yes Amazon has no specific limit for posts but I think 2 to 3 posts on daily basis is enough.

There is no any kind of restriction to post the amazon post, you can post as many as you can, But I will recommend to create 3 to 5 post each day.