What does “relatively” mean in “relatively enduring”?

The phrase is:

Structure is relatively enduring institutional and social arrangements within which scholars operate.

“Enduring”

Enduring means continuing over a substantial period rather than existing only briefly.

For example:

A university's peer-review system may continue for decades.

That is enduring.

By contrast:

An editor temporarily deciding to reject one particular paper.

That is an individual event, not normally a “structure.”

“Relatively”

Relatively means comparatively or to a significant degree, but not absolutely or permanently.

I use “relatively enduring” because institutions can change.

For example:

A university may have had a particular promotion system from 1990–2010, then change it in 2011.

It was therefore enduring for a substantial period, but not permanent.

So:

relatively enduring = stable enough over time to shape people's behavior, but capable of changing.

This qualification is important because saying simply “enduring” might suggest that the structure never changes.