For wolves the gestation period is 60 to 63 days but I don't know how this will vary considering there is no way of telling what percentage of genes were transferred from the wolf in that particular breeding. This is also the reason why putting a percentage of wolf genes to a wolfdog is a load of rubbish - personally I wouldn't trust any breeder who does it as they probably don't know what they're on about. Often people assume that 50% will come from each parent but actually this can vary from a 0% wolf to 100% dog ratio to a 100% wolf to 0% dog one (admittedly though a mid range value is more likely than these extreme examples).
In your defence though it is worth pointing out that genetic problems are most likely to occur if genetically similar dogs are bred, crosses are more often than not less prone to health problems than purebreds.
With reference to the barrage of criticism I'd just like to say that there is not sufficient evidence that you are a poor owner for me to join in, however it seems relevant to say that there is now a great deal of responsibility upon you to find good owners. Far too many wolfdogs end up being chained up in a back yard or put down. I don't condone the owning of one intrinsically but owners have to be very special and dedicated people in order to meet the behavioural needs of them, so please choose very carefully - for the dogs' sakes.