Er no, just look at my Turtle above it's horrendous! I leave it face up overnight and it just continues to lose - erratically. There is no consistency with the amount it loses per day. It's now 6 mins 15 secs behind an increase of 1min 20sec ish. Not good.
Der Amf - I am letting it run down now and so now declare my Turtle out of the Challenge.
I still have the mighty Landmaster ticking along and will update that another day.