Meaning of ぐらいでいいのでは in 「三回ぐらい噛んで飲み込めるぐらいでいいのでは？」


Can you tell me what ぐらいでいいのでは means?  
Also, I don't understand why potential form of the verb is used in this
sentence Can you help me to translate this sentence?

Context: The questioner asked how to eat "elegantly" while you talk to
someone, and the responder wrote:

> 口に運ぶ量を少なめにするといいと思いますよ。三回ぐらい噛んで飲み込める **ぐらいでいいのでは** ？




Thanks to your additional info, OP, the question is now answerable.

So, the overall context is:

> Person A: "How should/could one eat elegantly while speaking to another?"
>
> Person B:
> 「[口]{くち}に[運]{はこ}ぶ[量]{りょう}を[少]{すく}なめにするといいと[思]{おも}いますよ。[三回]{さんかい}ぐらい[噛]{か}んで[飲]{の}み[込]{こ}める
> **ぐらいでいい** のでは？ 」

「～～ぐらいでいいのでは？」 is an expression of **suggesting a method** for an action. It
gives a _**rough**_ _**idea**_ of what should suffice in achieving a good
result, which should explain why 「ぐらい = "approximately"」 is being used.

「～～でいいのでは？」 = 「～～でいいのでは **ないでしょうか** ？」 if that helps you understand the phrase
better. It is a way of asking the question: "Wouldn't ~~ suffice?", "Wouldn't
~~ be good enough?"

What is the rough idea being suggested? It is "bringing a somewhat small
amount of food into your mouth at a time so that _**one could swallow**_ it
only after chewing it about 3 times".

To say " _ **one could swallow**_ ", it uses the potential form 「飲み込める」.

