That three days is a parable..
Not literal.. no sacrifice was deemed acceptable If it lasted till the 3rd day.
Lev 7:18..
14th day of our heavenly Father’a month is His 6th work day, ending His 2nd week.
15th day is the weekly Sabbath every month and is a High sabbath in His 1st and 7th months,
16th day is the first ‘day’ of His 3rd week every month.
He showed the template to Ezekiel when He detailed, in ezekie
46, a new moon day, 6 work days, and the sabbath.
That sign of Jonah is an interesting study..there are a few ways to look at it.
One is certainly that Jerusalem is the heart of the earth that His message was pumped to the whole world from.
That 40 years after His death, Jerusalem and her ‘leaders’ didn’t repent (unlike Nine ah) and it was sacked.
And even that by count, the Savior was arrested the evening of the 13th by the hands of sinners. And spent the 14th day/night in those sinners hands. Laid in the tomb for a full 15th day/night and finally raised on the 16th ‘day’..
Three ‘days’ , three ‘nights’ separated from His Father and in the ‘heart’ of this wicked sinful world that as genesis states that the imagination of the thoughts of the ‘heart’ of man is only evil continually..
Gen 6:5
I tried for awhile to test that sign as literal but I was accepting the false premise that Rome tells time correctly.