I'm
very glad it's that easy for you, last time for me though took over a year's worth of some occasionally pretty intense prep (total probably about 1200-1500 K), including quite a few 20-40 K runs, some of them at sub zero °C (my 40K January walk to Dijon on a bad knee through fields and Burgundy vineyards and daringly through a 15K section of lonely desert forest wilderness, on a tight schedule ensuring being able to get the last bus back, being particularly memorable) -- even with all that, it still took about 5 weeks after I started to get my average daily Camino speed up towards 20 or so
aaah well, what goes around comes around ; I've been one of the fastest pilgrims, one of the most average speed, and one of the slowest --- all of these speeds have been marvellous in their own way !!!