How Many Years Did Pencil Spend Traveling in the Past?

Pencil spent such a long time travelling in the past, during TPOT 23 and TPOT 24 we got to see a few of her attempts from the past, using these attempts we can calculate how much time did pencil spend traveling in the past Thumbnail artist: ‪@clashftw‬ The Creators of BFDI: ‪@BFDI‬ Poses Made by: ‪@Jarleoo‬