Can H4 travel a year after visa being issued?


I am still in India and I have an approved H1B petition (my employer couldn’t send me over to US until now even though I got lucky in lottery in April 2015.) My wife is also in India but she is planning to stay in India for a year to complete her MBA. We were wondering if there’s any down side to applying for her H4 Visa right now along with my H1B since she will be able to join me in the US only in March 2017. Is there a time limit in which your H4 is revoked if you don’t travel?

Thanks a lot!

There is no downside of applying it now and not using it until Mar 2017. H-4 will not be withdrawn or canceled just b/c she decides to delay her travel.