It's impossible to say exactly how many years it will be until the next lunar eclipse on February 20th without knowing the specific year you're referring to. Here's why:

* Lunar eclipses are not predictable on a fixed calendar date: Lunar eclipses occur when the Earth passes directly between the Sun and the Moon. This alignment depends on the orbital positions of all three celestial bodies, which are constantly changing.

* The Saros Cycle: Lunar eclipses follow a pattern known as the Saros cycle, which is roughly 18 years, 11 days, and 8 hours. However, this cycle doesn't guarantee an eclipse will fall on the exact same date.

To determine when the next lunar eclipse will occur on February 20th, you'll need to consult a reliable source like:

* NASA's Eclipse Website: https://eclipse.gsfc.nasa.gov/lunar.html

* Time and Date Website: https://www.timeanddate.com/eclipse/

These websites provide comprehensive information about past, present, and future eclipses.