I agree with gam.
Now. There's nothing stopping you from rewording things in a couple of years; something along the lines of either "If Father is more than 45 minutes late, he has forfeited the visit and there will be no make-up time awarded.
If it were me, I'd say the forfeiture is applied for one visit only. If he can get your little 'un in the morning, the day after, he still has a shot...unless he's 45 minutes late for that one, too.
That being said, the more flexible you are the less likely Dad will throw a hissy fit. Not making a big deal about it will work in your favor and most importantly, little 'uns favor. This also doesn't mean that you have to sit by the door waiting - maybe you can contact him after 30 minutes for a "Hey, it's only me...give me a call if you still want to pick up kiddo; we've got a couple of chores to do but if you want, you can just send me a quick text and we can arrange a different meeting place"
I have one HUGE caveat though (surprise!

) and that is if he misses regular visitation on a ridiculous level...for example, Dad gets an overnight every week but he's used only one or two in the past 6 months, you may wish to think about modifying to include a clause about 'if Dad misses 6 consecutive visits, Mom has the right to allow visitation at her discretion".
Make sense?
There are several ways you can play with the wording. I do think gam's right though - the court isn't likely to act just yet.