Can parents go to US and come back multiple time with multiple entry visa

[DesiMumbai]

Hello
I am a Canadian PR. My parents will be applying for a multiple entry visit visa to Canada and the US.
Assuming they have been allowed to stay in Canada for 6 months, can they go to the US at the end of their permitted 6 month stay, stay in the US for a day or so, and come back to Canada to stay for another 6 months. Is there a minimum period of time you have to be outside Canada to be allowed back into Canada based on your Canadian multiple entry visa?

Thanks

[newtone]

Provided their Canadian multiple visa does not expire they can come in and out any number of times.

[DesiMumbai]

Thanks. But is there a minimum period of time you have to be outside Canada to be allowed back into Canada based on your Canadian multiple entry visa?

[newtone]

Not that I know of unless the Immigration Officer has put conditions on the visa

[job_seeker]

As long as they are still visiting and not living in Canada. A few days stay in the US may not work. The officer may suspect that their exit is  not a real exit and they may be given VRs (with caps, not the full 6 months allowed visit each time), when they re-enter, or not given a new stamp but just finish the duration of the allowed visit. 

Thanks. But is there a minimum period of time you have to be outside Canada to be allowed back into Canada based on your Canadian multiple entry visa?