We will be walking from Cordoba’s train station to the Juderia area. Could anyone suggest a nice walking route? Does it take about 25 minutes?
Practically any route you follow in Cordoba will be full of interesting sights and intriguing surprises. The gpx app Wikiloc has many walking routes laid out. Here's one:
https://www.wikiloc.com/walking-trails/2018-11-21-cordoba-iglesias-palacios-y-museos-del-casco-historico-30758335
From the train station, it is just a short walk through the park to the western arm of this route. You could look at the places it takes you to and map out a route between the train station and the Juderia that suits your interests. I'd guess half an hour would be about right, or more with stops. Have a wonderful walk!