Welcome to the Le Puy community on the Forum. If you've looked at the elevation profiles you'll know already that the Le Puy route is far from flat, especially the first third or so (until Figeac). At home on level ground I have no problem making 5 km/hr with a pack. On the Le Puy I was happy to average 3 km/hr over the 6 hours of walking -- not counting morning, noon, and afternoon breaks. On the other hand, the German walkers are notorious for making 40 km in a day quite regularly. On the flatter sections, between Cahors and Navarrenx (where you pick up the Pyrennees foothills), you might be able to do longer stages. However, the towns are very widely spaced in that area; so while you could walk further, there might not be a town where you'd like to stop. You have plenty of resources for planning, in the MMD and the Godescalso site. And you can make adjustments once you are walking and can see how it is working for you.