Drainage holes?

I made a kitty litter flower pot about 4 weeks ago cause it's pretty big. Well for the drainage holes I made about 10 with a nail, in the 4 corners, center and around the center. Well I started to worry that they aren't big enough and won't allow for good drainage. Does the size really matter? Because like I said the holes are about the size of an average nail. I'd like to say they're about 3-4mm wide. Will these provide drainage fine?

i use five gal buckets and i drilled about 15 on bottom all in different spot and about as wide as my pinky, also put 4 half inch above bottom, u mite want to make them a lil bigger just to be sure

Sweet, thanks. I'll just carve at them with a box cutter. To widen them the best I can.

I also made a kitty liter pot with a tidy cat 27 pd bucket that i fill up about 3/4 with soil and wrap the outside with the black stuff you put on a roof under the shingles (yeah its ghetto ) . It has 3 indented areas on the bottom, Two 1in by 4in and one big 5in square in the center.

Originally i put 6 1/4 inch holes in the middle indention and 3 on the 2 other parts. That killed my first seedling because the water would sit in the indented parts. So i put water in the empty bucket to see what was happening, water was standing under the indentions and not draining out.

I have added 3 holes on bottom of the raised parts and 2 on the sides of the indentions and put 3 holes on all sides of the center indention and made kinda like 4 troughs on on the far outside edge because the was raised even more than the inner parts. I put water in it and it all drained out.

I am waiting for my seeds and new potting mix i ordered to come in so i havent tried it with actual soil yet but i think i got it right now.

small holes get clogged easier

remember ou really cant have too many holes if youre making them only nail sized