How many trips we should have with wife?

Vacation with wife is not a vacation, its just change of location! 😀

The definition of trip is vague. Domestic, international or visit to home should all be considered as trip

Depends on what you can afford.

If you have the budget, try one international trip per year.
And one small long weekend trip within India around once every two months.

And once or twice in a month you can do some comedy show, theatre, long drive etc

Take trips together if your nature of travel aligns, you enjoy each other's company, you miss each other else just save money, sit at home or go with respective groups. We follow 1 international, 1 domestic trip. Hometown, drivable distances are separate