I am trying to make it so the tree grows after 45 mins, but the speed isn't changing for some reason.
I'm using a tick calculator and inputting the numbers, but it doesn't seem to work
http://mapmaking.fr/tick/

Please provide some information.
"It's not working" is nothing. I don't care how you came up with 45 * 60 * 20. Provide useful information please. New tree? Existing tree? Minecraft version? Bonsai version? Where did you enter the new grow time?

I am making a bonsai version for ferrostry

this is where I input the growth speed, 36000 ticks= 30 mins.

This is what i've made and copied to the bonsai tree mod.
openloader.zip
Note I do not have openloader installed.
Playing on version 1.15.2