I have a ssd, and my computer boots up so fast, it just doesn't look cool, moreover, the time is so less (2-3 seconds) that the startup splash has no time to show, which sucks, how to delay startup to atleast 15 seconds, to make it look like some "beast" is starting up 
yeah, most people want opposite of me, but yk XD
This thread is a first of its kind.
Most users post asking how to speed up boot. Here you are... being sane.
My SSD also boots too fast for the Zorin Splash screen.
I used to be able to get a couple things done or organized before the computer boots. Now I have to jump at its beck and call.
You might try increasing the grub timeout
sudo nano /etc/default/grub
GRUB_TIMEOUT=25
ctl+o, enter ctrl+x
sudo update grub
Set Plymouth loading splash screen delay:
sudo nano /etc/plymouth/plymouthd.conf
Add the line:
StartupDelay=25000
ctl+o, enter ctrl+x
sudo update-initramfs -u
You want to slow down, interesting. When You mean the Grub Menu You can choose the Step from @Aravisian but when You are on the Grub Timeout You could set it to -1 because then it will only disappear when You make a Choice.
That are Milliseconds?
Computers don't think all slow like we humans do. They get things to do and places to be.
I only ask because it is only a Number. To know what Unit it is could help to adjust it better.
That is the base default, but a user can set the unit with s for seconds, m for minutes and even d for days. I do not recommend that last one.
The decimal would appropriately travel
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