How long does it take on foot?
ci VUO-le — stress on 'vuo'. PIE-di — stress on first syllable.
After getting directions, to estimate the walking time.
'Ci vuole' (it takes) + time expression is the standard Italian way to express duration. For walking: 'ci vogliono venti minuti a piedi' (it takes twenty minutes on foot). 'A piedi' (on foot) specifies the mode of travel.
Sono più di venti minuti a piedi?
Is it more than twenty minutes on foot?
Setting a threshold for what you consider acceptable walking time
Ci vuole meno di un quarto d'ora?
Does it take less than a quarter of an hour?
'Quarto d'ora' is the Italian quarter hour
È meglio andare a piedi o in taxi?
Is it better to walk or take a taxi?
Asking for a recommendation
Florence is very compact and almost entirely walkable — the distance from the train station to the Uffizi Gallery is about 15 minutes on foot. Rome is larger and walking between major sights can take 30-45 minutes. Using Rome's metro (linee A and B) between distant attractions is highly recommended in summer heat.