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There is no magic number when it comes to posting. Some affiliates can post daily, whereas others have to update their blogs every other day. The number of posts depends on the niche you're in and the time you have available to post.
The good news is that you can post as many times as you want. For a very specific niche, you may even have to post too frequently. The main thing is to make sure that you're posting excellent and relevant content.
5000 words per day and 15 posts per week are ideal for affiliate marketing. If you are writing more than this, you may be missing out on posting better-quality articles and you will also be spending more time on writing, which will burn you out.
If you are posting less than this, you are missing out on a lot of leads. You can always be at the top of your niche with 5000 words per day and 15 posts per week.
You can't work on a rigid schedule and expect everything to work correctly. Posting more than twice a week is not what makes you successful in affiliate marketing.
It's all about being consistent. Post when you have time and regularly.
Posting twice a week is more than enough, but try to post more to make your readers happy.
Post, interact and be there for your readers if you do that you don't need to do something more.