> It’s virtually impossible for me to estimate how long it will take to fix a bug, until the job is done.

This is explained later in the post. The 2 day hard limit is applied not to the estimate but rather to the actual work: "If something is ballooning, cut your losses. File a proper bug, move it to the backlog, pick something else."

Most of the work in finding/fixing bugs is reproducing them reliably enough to determine the root cause.

Once I find a bug, the fix is often negligible.

But I can get into a rabbithole, tracking down the root cause. I don’t know if I’ve ever spent more than a day, trying to pin down a bug, but I have walked away from rabbitholes, a couple of times. I hate doing that. Leaves an unscratchable itch.