Don't get me wrong, but there are little to no songs which are 480, let alone 479.971... Also, you will have to use a 4/1 structure (from big white tick to big white tick, use a low SV (0.4-0.6) and add a 0.5x SV multiplier throughout the whole map
Basically, all songs can get easy songs, look at this map of mine for example (it's ranked) -> https://osu.ppy.sh/s/399585