not for

[navi tasan]

Are these sentences correct:
1-I have been here for not three days.
2-I have been here for not three days yet.
3-I have been here for not even three days.

4-I have been here not for three days.
5-I have been here not for three days yet.
6-I have been here not even for three days.

 

[RonBee]

Only the third one is correct. The sixth one would be correct if for was not in that sentence.