Spanish phrase
¿Cuánto tiempo crees que ~?
Meaning
How long do you think ___ will last?
When to use it
It asks for an estimate of duration. It is used in casual conversation to request someone's guess about how long an event or condition will continue, neutral informal tone.
Example dialogue
¿Cuánto tiempo crees que dure esto?
How long do you think this will last?
Creo que durará unas dos semanas.
I think it will last about two weeks.