The speed at which a giant human would run is a matter of speculation since giants, as depicted in mythology and fiction, do not exist in reality. Therefore, we don't have any empirical data or scientific understanding of the physical capabilities of giants.
However, if we were to assume that a giant human maintained similar proportions to a regular-sized human, it is reasonable to expect that their running speed would be affected by several factors. One important factor is stride length, which is influenced by the length of the legs. A larger-sized human would likely have longer legs, potentially allowing for greater stride length and potentially higher running speeds.
That being said, it is important to note that there are limitations to human physiology and biomechanics. Factors such as muscle strength, cardiovascular capacity, and coordination also play significant roles in determining running speed. While a giant human might have certain advantages due to their larger size, it is unclear how these factors would interact and whether they would allow for proportionally higher running speeds.
Ultimately, the running speed of a giant human is a hypothetical concept that falls outside the realm of current scientific understanding and research.