Any limit on months before re-visting

[VisitF1]

Is there anny limit before re-visiting to USA. My parents stayed in US for around 6 months and left before I-94 expiry date. I want to call them again. Do I need to wait for certain months to be on safe side?

[peace999]

Is there anny limit before re-visiting to USA. My parents stayed in US for around 6 months and left before I-94 expiry date. I want to call them again. Do I need to wait for certain months to be on safe side?

No rule for time interval between 2 visits. It depends on your purpose and your previous duration of stay. It should appear that you are visting rather than trying to stay most of the time in US.

With parents staying 6 months , leave a gap of another 5-6 months to be on the safe side.