Why is my hot tap taking so long?
If your hot tap is taking a long time there are a few things that may be causing the issue.
1) Your hole saw may be dull.
Solution: Replace worn out hole saw.
2) You may be pushing too hard at the start of a tap. Pushing too hard will "flex" the pilot bit causing the pilot hole to not be centered with the hole saw. This will create a conflict with the hole saw and the pilot bit almost preventing a tap.
Solution: remove the pilot bit and complete the tap without it.