How many requests are made to Contentful API with contentful-source-plugin ?

[auswin-8]

When we use contentful-source-plugin with Gatsby and build the site ,

• Will Gatsby make an initial request to Contentful API and fetch the entire space data and store it in its cache or in its data layer?
• After this , all the Graphql queries what we have , will be resolved from its cache (or data layer) and not from Contentful API ?
• Meaning that it will only call Contentful API once when building the site ? and not for every query ?

I am trying to understand this inorder to estimate the Rate limits for my application with Contentful GraphQl API .