The right to visits in pre-trial detention is secured by statute under section 188 StPO: at least twice a week, each visit lasting at least half an hour.
Under section 188 StPO an accused person in pre-trial detention has a right to visits at least twice a week, each lasting at least half an hour. Within the visiting hours set by the institution, additional visits are possible as often as the institution's operations allow. The visiting right extends to relatives and other trusted persons. The institution may regulate visits organisationally but may not reduce them below the statutory minimum.
What to do now: First, find out the current visiting hours of the competent institution and arrange an appointment in good time. Second, clarify whether the institution requires a visitor's pass or advance registration. Third, if a visit is refused or reduced below the minimum, seek legal help without delay.