Standard

Standard games are one-on-one with a 60 card minimum for the main deck (up to 15 card sideboard). Winner is determined either by best of one, or best of three games. These games should last standard length for a game (about 20 minutes on average).
How does set rotation work? Each year, new Magic sets are released and added to Standard. Once per year, after the fall set Prerelease, the four oldest sets in Standard rotate out.