We are a family of 4, kids are now 11 & 14, but we still use relaxed pace. Between general wandering when moving between places, bathroom breaks and park congestion the relaxed setting gives you a little more leeway.
Even if everyone were in perfect health, fast walkers and focused on the plan, 7 is a lot of people to herd. Things just happen that take up time.
In fact, I also tend to add a general 15-30 minute break in each morning and afternoon plan in addition to meal breaks just to compensate a little more. If the break isn’t needed, we move on to the next thing, but I’d rather be ahead of plan than trying to play catch up.
I know TP takes CL and dates into consideration when crunching the numbers, but after a 1st trip where we pushed a little too much to keep up with the plan, I feel better with a buffer.