How long do I need to monitor my protein intake?

For the rest of your life. Seriously.

yeah my Drs said Forever and ever and ever.... and ever. For real or you could get really sick. Same with Vitamins

The protein amount that is usually specified is nothing special (maybe a bit of overkill, but not much) - it represents the amount that we generally need to maintain our lean body, or muscle, mass, and will not change appreciably as we move from weight loss into long term maintenance. What will change over time is the amount of other things that will be consumed with it - fruits, vegetables, grains, legumes, etc. So things won't seem as protein intense over time. It will also become a basic habit (did you worry about your protein intake before you decided on WLS?)

As with vitamins, it is something that we will need to make sure we take in some form - some will need more than others - and periodic lab tests will guide us on what and how much we need to take (including protein.)

So, do you need to count and monitor it forever? Not really, as it will usually become habit and take care of itself. For instance, protein is only about 20% of my diet, so it isn't something that I think a lot about. Now, if you decide to make major changes to your diet or lifestyle (like going vegan or keto) then you should revisit the subject to make sure that you are getting enough of what you need.