Retention "till"

[TFiFiE]

The till setting is misleadingly named, because being under retention, it would imply that test runs up to the given time are retained rather than deleted or that test runs are kept until that point in time is reached. since (or similar) would be a much more logical choice and would also be consistent with amount by having the phrasing be in terms of what is kept. Examples where this has tripped up people:
GHPReporter/Ghpr.MSTest#23 (comment)
GHPReporter/Ghpr.Console#43 (comment)

[elv1s42]

Thank you for the issue!

I agree this makes sense, going to fix the naming.
The since name looks like a good one.