A deacon’s daily life is much like any other person. Unless they are retired they go to work, engage in activities with family and friends, work around their house. Deacons are expected to meet with their pastor yearly and fill out a ministry commitment, that is what they are going to do with regard to parish work. In our diocese deacons are expected to give about 10 hours a week to parish work, but many do more and many do less. Most of that is done on Sundays, but also during the week if they have a duty day, preside at wake services, visit the sick, or do marriage or baptismal interviews. Some deacons are in charge of a particular ministry in the parish. This is all worked out with the pastor and varies from deacon to deacon.
My husband has been a deacon for almost 20 years. Some weeks he has no parish obligations other than assisting at mass. Other weeks he has a lot to do. It all depends on the parish and what is happening there. Also if there are a number of priests and deacons in the parish, he might do a lot less. Some deacons are employed in the parish as DRE, business manager or outreach coordinator, but that is not considered part of their diaconal work, although it could overlap.