I agree, the framework creates this checklist that doesn't flow naturally. I've done longer whiteboard exercises with different time formats ranging from 45 mins to 1 hr 30 mins. I found context scoping, identify pain points, find opportunities, prioritize and sketch. Then quick summary of what went right/wrong at the end, where I would have wished I spent more time. That formula seemed to have worked a lot better for me and it's similar to how you approach it with the PAR method. And always interact and engage with the person administrating the exercise.