The two boys are extremely hyper. They're also very small for their age. This last year has been rough on the whole family, because they were having a lot of trouble with public school. They were moved to a private school which has helped a lot. Along with their school work, the reduction in stress has also helped their home behavior (also, they now go to their Uncle Jack's house every day after school, which gives them a ton of boys to play with, and lets them work off some of that excess energy).
Still, they are boys - young, energetic boys - and they do get in trouble. While your wife finds a belt on their pants usually works, you prefer your hand - occasionally on trousers (not jeans), but more often on their boxer briefs or even bare. While you'd used the belt on your older kids, none of them were as hyper as these two, and you just haven't used it yet.
Your spouse's Harley has been running a bit rough lately, so you've spent part of your afternoon checking everything and giving it a tune up. The boys have helped you a bit. They're in the garage with you, when one of their friends comes by. Some of the boys are going to a vacant lot, where they've set up a bike trail to do some BMX stunts. There's plenty of time for them to go before their curfew, but there are violent thunder storms predicted for this evening. When they ask, you check your phone, see when the storms are expected, then tell them they can go for one hour. You confirm that they both have a way of telling time, and they take off.
You're putting the bike back together, when you have to get up and turn on the light. You realize the thunderstorm is rolling in, so you check the time. The boys are either 15 minutes late, or they left their bikes in the yard again.
No bikes in the yard, so you fire up your own Harley and ride down to the lot. Sure enough, both boys are still there. You tell them they need to get home, and tell the other boys that there are reports of hail and high winds with this storm, so they'd better head home as well.
Normally, you don't make a huge deal out of the boys being a bit late, blaming it on their ADHD. You would normally either take the time off something else (like screen time), or simply make the time late as corner time. On the other hand, you were very specific about when they needed to be home today and why.
Is this normal tardiness or disobedience? Will the boys be sitting in time out or not sitting at all?