How long to reach top speed

[thebottomfish]

Compression checks out, pulls strong for what it is, my rpms are low which is something I have to play with this year, it seems like props are not effecting my rpms can't get above 5200 even after bouncing around between 17, 15 and 13 pitch props
Takes about 30 seconds to top out so I guess I'm not doing too bad, just would like to see more than 32 mph out of her and get the rpms up