How much time is lost from not doing fast 4-2 and bullet bill glitch?

Whats the lowest time that can be gotten without those two glitches if played flawlessly?

Fast 4-2 saves 1 frame rule over the 3-bump method and bullet bill saves 2 frame rules over a perfect 342 in 8-2, so 1.05 seconds are lost from not doing them.

This theory TAS clocks in at 4:56.92: This does everything perfectly that is human do-able, and does 3 backwards jumps which causes Mario to accelerate faster from an at rest position than simply holding right.

The fastest 8-4 a human has done [http://www.speedrun.com/run/9mejr8qy] would yield a time of 4:57.01, assuming a perfect run until 8-4.

4:57.01 + 0:01.05 = 4:58.06, so theoretically the lowest time possible without those two tricks you mentioned is a 4:58.06. Or if you think you can break the fastest 8-4 ever done by a human in a practice setting, 4:57.97. Hope this answers your question =)

Ok, thanks for such a concise reply nickj109 it's much appreciated.

In addition to the excellent answer by Nickj I'd just like to add the best time that someone has actually gotten with said strategies. I thought Andrewg had a 4:58.29 but I can't find it so I'll link his 4:58.34