I do agree that you should be able to fix most bugs in 2 days or less. If you have many bugs taking longer to fix, it may be an indication that you may have systemic issues. (e.g design, architectural, tooling, environment access, test infrastructure, etc)

Sure, but you never know if this next bug is another fix it in 1 hour, or it will take months to figure out. I have had a few "The is not spelled 'Teh'" bugs that it takes longer to find the code in question with grep than to fix, but most are a not that obvious and so you don't know if there are 2 hours left or not until 2 hours latter when you know you found something or are still looking. (or unless you think you fixed it and the time to verify the test is about 2 hours, but then only if your fix worked)