Are both of these sentences correct to say? (We will finish everything in about 10 min) :
- Мы закончим всё минут через десять.
- Мы закончим всё за десять минут.
1.Мы закончим всё минут через десять.
The sentence is grammatical with emphasis on when everything will be done. через means in approximately 10 minutes
2.Мы закончим всё за десять минут.
This one has got another meaning due to the preposition за: It will take us ten minutes to do it.(How much time will it take?) Both are fine.