Would it be even reasonable to fetch 100 to 1000 URLs at once?

[ChiefChippy2]

I am creating a project for personal use, and I would need to fetch similar URLs ( but never identical ) 100 to 1000 times instantly. They are all from the same domain, but different path by the way.

Now my concerns are : 

1. How long would it take ( with UrlFetchApp.fetchall() )

2. Would I get blocked by the site for too much network requests?

3. Will this actually use up my quota for urlfetchapp calls if I call it too much times?

[Monique Szpak]

1. Some info about fetchall including benchmarks and code... https://gist.github.com/tanaikech/c0f383034045ab63c19604139ecb0728

2. Depends on the site

3. URL Fetch calls limit is 20,000/day according to the list of service quotas: https://developers.google.com/apps-script/guides/services/quotas