The time it takes to bike 6 miles can vary based on a number of factors, such as the rider's skill level, the terrain, and the bike being used. On average, a person biking at a moderate pace on a flat road can complete 6 miles in around 30 minutes. However, a more experienced rider on a road bike may be able to complete the distance in less time, while a less experienced rider or someone biking on a heavier bike or uphill terrain may take longer.