An egg takes approximately 25 (give or take a few hours depending on what source you use) to form from start to finish. Generally speaking, an egg that is "in the pipe" is going to see itself through to completion (being laid) regardless - so a disruption today won't necessarily mean that today's egg doesn't get laid - it is more likely to mean that IF the bird undergoes a stressor you may see a disruption a day or two later as her system reacts in a way that would interrupt the beginning of that next egg. Certain stressors can cause a hen to have an interruption in production or to produce some pretty wonky eggs as her system reacts - but unless your kids are just being absolutely outrageous (not saying they are) in their checking that is not one of them. We regularly have hens hop in their box and lay an egg while we are out cleaning the coop, hanging with our flock, etc -- if your birds are used to the level of activity it isn't a stressor for them.