You should aim to meet regularly for at least 30 minutes, twice a week during their first month and at least once a month thereafter. This meeting (often best held over lunch or in an informal setting), should be used to discuss any non-urgent issues the new employee may have.
During the working day, it may be reasonable to expect as many as 4 or 5 brief queries a day from the new employee in the first few days, tapering down to one or two a day thereafter. Although all new employees are different, after 2-3 months, you may hear little or nothing from them on a daily basis. THIS IS A GOOD SIGN. If you are still getting a large number of ‘urgent’ queries after the first month, then you should speak to the program coordinator.