This recipe was adapted from: tjek.nu/r/cbXh
Steeping for 25-30 days .

This recipe was originally crafted in 2017 and, from the comments, is still being mixed today. I, of course, don't have Jamaican Rum flavoring but I do have TPA's Kentucky Bourbon and that seemed like a logical substitution. I'm not sure that it will need 25-30 days steep. I'm pretty sure that after a week it will be just fine.
Check out the original mixer of the recipe, a dude named Chapel. He's got a bunch of really good recipes. I urge you to give this one a chance.