Looking on the internet deeply has found these results:

as many as required is the most popular phrase on the web.

call as much as required 10 results on the web	as many as required 12,630 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Is Greek mythology a required subject in your: (check as many as required) School School district. State Not required 3. What grade level(s) do you teach? K School Education (add as many as required). Institution type. Institution name. Institution location. Institution dates. Qualification type. Subjects & Grades. links below). Within each category, select packet(s) of reports the user needs to view. Select as many as required and list them in the space provided below. 5th 1As much or as many as required: [ as determiner ] : too much work and not enough people to do it there was just enough room for two cars [ as pronoun ] ...

call as much as required

10 results on the web

as many as required

12,630 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Is Greek mythology a required subject in your: (check as many as required) School School district. State Not required 3. What grade level(s) do you teach? K
School Education (add as many as required). Institution type. Institution name. Institution location. Institution dates. Qualification type. Subjects & Grades.
links below). Within each category, select packet(s) of reports the user needs to view. Select as many as required and list them in the space provided below.
5th
1As much or as many as required: [ as determiner ] : too much work and not enough people to do it there was just enough room for two cars [ as pronoun ] ...