Final answer:
Bill Gates attended college for three years at Harvard University before dropping out to focus on Microsoft.
Step-by-step explanation:
Bill Gates, co-founder of Microsoft and a well-known technology entrepreneur, attended college for a total of three years before dropping out to pursue his business ambitions with Microsoft. Gates enrolled at Harvard University in the fall of 1973 and left in the spring of 1975, without completing a degree. While a routine path for full-time engineering students is between four and six years to graduate, Gates' early exit from college to establish one of the most influential technology companies is a notable deviation from the typical college tenure.