I looked on the VMCAS help center and they say not to list any activities you haven't started with, and to only add the number of hours you've completed so far. When I applied, I had just started an internship that was going to last until December, so when I put it into VMCAS, I put the number of hours I'd completed at that point (making sure to wait just long enough to squeeze in a few more hours haha) and wrote at the end of my description that this was a full-time internship I would be participating in until December. That way schools can do the math if they feel like it, but if life hit the fan and I for some reason wasn't able to continue my internship, I wouldn't have been overexaggerating the number of hours I had actually done. I don't know if it truly matters either way, and if a vet school tells you to add all of your projected hours, they definitely know more than I do haha, but it's what I felt most comfortable with!