I've done them lots of times. Like he said, cutting the ends off helps keep them crisp. I think the flowers have something in them that keeps them from staying crisp (enzyme or something?).
In my experience, it doesn't take weeks to get good, but it depends on how sour you want them. I agree that it takes about 3 days to get pretty much half sour in the summer, but the temperature would slow it down some. I would start checking them at 3 days, but expect maybe 5-7-10 to be more likely at that temp.
One suggestion I would make is that people tend to like variety, so if you start them and check them when they are at different stages, you can transfer them to the fridge at different levels of sourness. So start them and check after 5 days, maybe pull some out and put in the fridge. Then check some after 10 days or two weeks and pull some more out. Let a few go longer and add them. I prefer half sours, where they are still bright green and very crisp. But that's just me!
You can also pull them out of the brine, boil the brine, cool it, and then return the pickles, and it will quickly slow the fermentation down (especially when refrigerated). Depends on how much you're making and how long it will take to get through them.
You could also add sugar to the brine at that point, boil and cool, and get a hybrid sweet & sour pickle.
And one final thing to think about - I would mark those buckets and only use them for wild ferments. The plastic could harbor those bugs and you wouldn't want them in a beer, for instance. Or you might! But I would dedicate the buckets to pickles and kraut.
Homemade pickles are awesome. That's actually what got me to try making beer again after some mediocre results.