As one of those people who had thousands of hours of vet experience plus around 1,200 hours of animal experience (and some research experience), how many hours you need to get into vet school heavily depends on the rest of your application. I like to think of the application as a pool or a bucket or whatever liquid-holding apparatus you prefer. You can fill it up with a lot of things. With stellar academics, great letters of rec, and quality extracurriculars you can fill it up almost completely. Then you would need a small number of hours to fill it the rest of the way, sometimes just a few hundred hours. As long as you can demonstrate that you got a good feel for the veterinary profession.
If your academics are mediocre but you have good letters, and some good extracurriculars, you might still be able to get in with the same number of hours, but you’re starting off with your pool/bucket less full than the previous person. So it would be a good idea to get even more quality hours, meaning diversify your hours or get a lot that give you good experience and show that you have a better understanding of the field than interviewers would expect.
The point being, while academics are most frequently the things that will fill up your pool/bucket the most, the less “stellar” you are in that area, the more you’ll have to fill it up with other things to give yourself a good chance. At the end of the day, there’s no one way to actually get in, but there is a way to ensure that you’re at least not behind. Have academics that are at or around the average of the school you want to apply to (or even below depending on the rest of your application), get people you really trust to write you good letters of recommendation, get veterinary and animal experience hours that will demonstrate that you really know the profession and the challenges veterinarians face, and try to do some worthwhile things unrelated to animals as well.