That calculator says that an eight pound turkey (8 lbs is approximately 3.6 kg) will take 2 days and 0 hours in the fridge or 4 hour using the cold water thawing method.For that size turkey, a minimum of three days in the refrigerator. Even if it thaws before the three days are up, it is still refrigerated and safe to eat.
https://www.butterball.com/calculators-conversions will help, perhaps.
Yup, at room temperature the outside will be thawed and starting to spoil while the inside is still frozen. Depending on where the person lives and their weather at the time they want to thaw the bird, a garage or shed might be cool enough. It certainly won't be here on the Island of Montreal for Canadian Thanksgiving this year, which is on Monday of next week. I personally prefer defrosting frozen meat of any kind in cold running water.You really need to defrost in the fridge...or think of some other way to keep the bird cold. Room temp, it will spoil too quickly.
You could look for a "fresh" (not frozen) turkey. They are sooooo much better anyway!
And, if you wish to brine the turkey, you'll need to do that a couple of days in advance of the cooking day...and that needs to be done in a pot in the fridge.
That will be the biggest size we find here (Zambia) as well and only around christmas. Biggest chicken I've seen for sale is below 2 kg.Check the weight again. 3.5 kilos is less than 8 pounds. I have had chickens bigger than that.