Welcome to the Back and Neck Community. Members are here to provide assistance and support to individuals experiencing symptoms related to possible abnormal conditions of the cervical and/or lumbar spine. Advice given is non-professional and is based primarily on personal experiences.
Standing for long periods of time can cause fatigue and complaints of discomfort in the low back and legs. However, absent any prior pathology (abnormal conditions), it does not tend to cause any permanent harm. It would be helpful to be able to have periodic rest periods, but that would depend on your employee duties and availability of relief.
If you are having specific symptoms, it would be helpful to know more about your current situation before making any determination of potential harm.
Please post again if you can provide further information.
Best wishes -----