How far has the page been seen?

You can use the custom formula for analyzing this question.
image2022-6-2_14-59-21.png 

Furthermore, the text parameter can be used as a dimension.
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If the page is not scrollable and, thus, always shown completely, the value for the Scroll Depth is "100".


How far are pages scrolled, that have a certain page length?

Use the parameter "Page Length" for filtering this analysis.

Example: Take only pages into account, that have a minimum length of 500 pixels.

What percentage of all page calls have been seen for more than 50 percent?

For this analysis, we can use the custom formula.