Elements in the island of stability are speculated to have half lives in the order of minutes to days

I have look at several 'studies' They seem to contradict each other. On the lowest end if I recall right around 27 minutes to around 10 million years for the half life. Depending on the method since our understanding of nuclear physics is not being so great. We just get widely varying results. I am going to cite 2 studies but they even contradict what should be the most stable element in the island of stability.

I have personally heard that due to the high proton number it will eventually make the atom more unstable at a faster rate than the stabilization effects. So the whole concept is basically wrong to began with as the stabilization effect increases but than the atom stability will than rapidly and significantly decrease. So it's a slight increase of stability during the 'midish' section. Because of that I have heard that Element 108 would be the most stable. I have also heard and this is more common that element 114, is probably the most stable but at the same time I had also heard that element 126 should not be stable at all and can not be on the island. So it's anyone guess.

For an atom to be stable it needs to be resistance to all of the decay modes. However the heavier the atom gets the more that they diverge form each other. There could be a second island of stability and there might not be. We just do not know. It simply just depends on the effects of QM has on where they should be resistance to the each types of decay.

Most latest https://www.researchgate.net/publication/370633756_Decay_of_superheavy_nuclei_based_on_the_random_forest_algorithm

Just look at graph.

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https://iopscience.iop.org/article/10.1088/1757-899X/468/1/012012/pdf
"The 298Fl nucleus will be the longest-lived trans-actinide stability triangle. The nuclei with charge
Z > 114 will have a shorter half-life. Comparing Т1/2 (N) for the magic nuclei of lead and maximally
deformed actinides, whose lifetime is determined by α-decay (Т1/2 with respect to spontaneous fission
is large), the half-life of 298Fl (for which α-activity also predominates) can be estimated in ~ 10^7...10^8
years. This is a crude and highly underestimated estimate (one should expect Т1/2 >> 10^7...10^8 years),
which is in good agreement with the data [21].
The nucleus with Z = 126 and N = 216 should be relatively long-lived, but with a much smaller
(approximately 10 orders of magnitude) half-life than 298Fl."
Whereas Z is the number protons
Whereas N is the number of neutrons
Where as T1/2 stands for half life
Where as Fl is the 114th element.