Andy M.
Certified Pretend Chef
A 4k bird. Four kilograms is almost 9 pounds. That bird should thaw easily in time for Christmas dinner or even for tonight if that's the plan.
I don't think it's close to 40F. It seems as cold as ice water. I've tried in the past - a glass of ice water and winter tap water and they feel the same. If I had thermometer that measured in the right temperature range and was immersible, I would go measure it now.
An instant-read thermometer for meat should work for water, too. Do you have one of those?