My two are amazing at holding it too - doesn't matter what time they are let out in the morning, no problems and if it's raining they would hold on until lunchtime given the choice

I had a problem with Dave recently as he was so freaked out by the building works in the garden, he didn't think he could pee out there but he's over it now thank goodness

Normy I have problems with in the snow as she absolutely loves it and eats so so much that I usually come down to a swimming pool in the morning

Other than that she's cast iron girl too