unsure on how long, must to check the Monthly Visa Bulletin, studying F2A designator there for being 'current'.
could be a year, could be 4 years - no one knows and it's a great prognostication game here, to forecast which month/year will be 'current' next month.
'Current' is a moving target...
Homework assignment for you:
1. study how to chase after spousal visa for F2A category here and
2. become familar with the Monthly Visa bulletin.
