minimum period vs. at least how long

[jokaec1]

1) What is the minimum period I need to stay in US in order to apply for the green card?
2) At least how long do I need to stay in US in order to apply for the green card?
Are these sentences correct? If not, please help to correct them. Thank you!

 

[Skrej]

Both are okay, although I prefer #1.

 

[teechar]

1) What is the minimum period I need to stay in the US in order to apply for the green card?
2) [STRIKE]At least[/STRIKE] How long do I need to stay in the US in order to apply for the green card?
Are these sentences correct? If not, please help to correct them. Thank you!

See above.
;-)