This script shows a playtime window on the upper left hand side of the screen by default. This is changeable by editing the WINDOWX and WINDOWY constants.
It measures the total time played.
Credits To Adon, for making most of the script, and Rhyme and Craze for helping me a ton with the Scene_Map. Also, make sure you place on the bottom of all scripts, and it may not be compatible with scripts that modify Scene_Map, update and start specifically.