Biggest time losses were on Stage 4, because sometimes when landing on a block you can pickup they game makes you completely stop moving. Stage 4 does it to me 95% of the time and it happened this run as well. Don't really know what causes it and the only stages that I have issues with it are 4 and 6. I also lost time on Stage 9 "Moon" by jumping into the ceiling then missing the bounce off the enemy. Sub 8:20 is possible and with good RNG I'd wager sub 8:15 is as well with a really solid run.
Played on bgb 1.5.7