We do not know here from Pontius Pilate. We don't know "days." We only know that he shortened the malefactor's legs to shorten their hours so they couldn't raise up to breathe. They died from pulmonary edema, congestion of the heart. It would take some other historical account to give us the confidence that it took days, rather than hours.
Are you only relying on one book here? I am not, in this matter.
Jesus died by Himself giving up his spirit to God. His body went to the grave, and His soul to Paradise to preach to the OT saints there. Jesus knew, by foreknowledge, that one of the malefactors would be there, too, with Him.
I see that you have missed the point again. There are many texts from the Roman era and later historical texts that give a rather lucid and accurate description of the practices of crucifixion in excruciating detail. Google will avail you access to many of them.
But Pilate expressing surprise that Jesus died that day, rather than on subsequent days is enough Biblical proof for those other than the most obtuse.
By the way, Jesus went to hell to speak to those imprisoned there. If that is what you choose to call Paradise, then so be it.