my parent were a green card holder since OCT 20, 2009 . Totally, they have been in united state for 2 years and 2 months and 20 days. For more info:
1- Two months stayed and return
2- One year stayed and return
3- One year stayed and return
4- 20 days stayed and return
and in all each section above they were out for 6 months.
Can they apply for citizenship now or they should wait until this duration turned into 5 years?