My Reality

In general syrups are about making medicine sweeter and more condensed for one of a few reasons: 1. you can take it more easily
2. so that you can take less of it
3. So that you can store it and take it with water later.

In general boil the herbs or fruit etc for about 20-30 minutes.
Strain.
Add sweetner.

Anything you can make tea out of can be made into a syrup from herbs to fruit and vegetables. Just make sure it's edible

They need to sit for: none, ready immediately
Lasts: about a month.

Honey does not go bad, but herbs can and adding water to herbs is what can introduce the place to culture bacteria or mold. So if it smells ok and looks ok, it's probably ok.

The repro health/iron batch that I just made is the third. I made enough so that I cna take some every day either by dropperfull if I'm on the go, but mostly so that I can use it as a tea some times during the day as an iron supplement.

The general idea is to take a tea and boil it until it's half of what the original water then take that and add about 1/2 again as much honey while it's warm so that you have a syrup. The more honey/sweetner you add, the thicker it will be. The general rule is to just taste it to see if it works for you. And remember you can always add more, but you can't add less.