>>2405088>How long does it take for your feet / legs to adjust and strengthen?Depends on you. It wasn't to long for me to be able to hike 20 km-s with a Fivefingers.
>Is there terrain where they are uncomfortable?Little rocks are bad, takes much more stamina. If your feet is tired it can really hurt.
I'm using a Merrel Vapor Glove for work and similar things because you can use normal shocks with it.