Most times dilating eye drops last between 4 hours to 24 hours.
The length of time the dilating eye drops last will depend on the strength and type of the dilating eye drops.
It also depends on the individual person.
Dilation with dilating eye drops can last longer in some people with lighter colored eyes, and in some cases, may last longer than 24 hours.
If you go to an eye doctor and get your eyes tested you should have someone to drive you home if possible because your eyes may be a bit blurry and cause blurry vision for up to 4 hours or sometimes longer.
Whenever I've had dilating eye drops put into my eyes for dilation the dilating eye drops started wearing off after a few hours.
Within 4 hours I was able to see enough to drive.