How many wells (and how deep) and on what area one needs for a 1 (one) GWe sustained over 100 years? Timespan is critical too you know, you are cooling the rock

How many wells (and how deep) and on what area one needs for a 1 (one) GWe sustained over 100 years? Timespan is critical too you know, you are cooling the rock below, so heat flow must be kept constant over the life of the plant. Any numbers for that?