What is WFO policy in IBM..Can we do 12 days at once and how many hours we have to stay in office for it to be considered.

There is no minimum hours required policy in IBM just swipe in there is no swipe out time calculated. We cannot got to office 12 days at once because the WFO is calculated based on weekly swipe in.

Yes. But at least 1 day swipe required per month

You may got automated email from hr if you are not in office for continues 15 days