Aty place we don't estimate time at all. It's nearly impossible. But value of the fix or feature is loads easier to estimate and measure. Bug $X is worth $10000, dedicated $5000 to fix it. Check progress. Dev says almost done? One more cycle. Still seems far? Punt.

I'm always confounded when managers want a time estimate but cannot provide a value estimate.

The goal is the same: fix important/urgent bugs, develop product and keep good close velocity.