"El tiempo vuela como una flecha las moscas de la fruta como un plátano"

Simplified Meaning:

Time always moves forward quickly, just like an arrow shot from a bow moves fast in one direction. You can't stop time or slow it down; it keeps going. For example, when you're having fun, hours can feel like minutes because you are fully engaged and happy. Similarly, when you're busy, the day can pass in a blink. On the other hand, fruit flies are small insects that are attracted to ripe or decaying fruits like bananas. They seem to appear out of nowhere, and you'll often find them buzzing around your kitchen if you leave fruit out for too long. Just like these flies are drawn to bananas, some things in life happen naturally and without warning. Taken together, this saying reminds us that time is valuable and always moving, so we should make the most of it. It also humorously points out that some events and results are inevitable, just like fruit flies showing up when fruit is left out. So, it's a good idea to manage your time wisely and expect the unexpected.