Inexperienced hikers should note that all kilometres undertaken after lunch are exactly twice as long as kilometres walked before lunch. This is a long-standing European tradition.
It is also worth noting that all kilometres walked in heavy rain are equivalent to 1.5 kilometres in dry conditions.
Other kilometres may vary in actual length depending on the weight of your pack, comfort of your boots, and the charm of your walking companions.
None of this really matters because you will reach your destination. Your bunk bed will be as comfortable as necessary. The Menu Peregrino will include protein, carbohydrates and wine. And, in the morning, if my old Gods, yours, or whatever one(s) are awake at the time are smiling, you'll get to do it all over again