Monday Hour One – Falling Behind

Hi! This is my first week trying Monday Hour One and I know that as I continue to do it, I’ll continue to learn the best ways to use this tool.
I’ve run into a few issues I’d love some guidance on:
– A mandatory work meeting invite will pop up for me last minute—do I shift my whole schedule around to accomodate?
– Sometimes I’ll misjudge the time it takes me to do something—either give myself way too much time or way too little—and I’ll fall behind on my schedule (or have unplanned free time). Should I just keep going and not try to make up for previous tasks?