can i do this

Yes, you can be on duty on seven consecutive CALENDAR days, depending on what time you commenced duty on the first day. The regulations state that a driver cannot be on duty for more than six consecutive periods of 24 hrs, therefore, if for example you started on Your first day at 08.00hrs, you could still be on duty until 08.00 hrs on the seventh CALENDAR day following.
(This assumes that you had a full weekly rest at the end of your previous permitted shifts)
I think!!!