How many links my Rolex should come with?

If you are a bit familiar with Rolex watches, 95% are the chances you reply to this question with : 13 links!
In this case your are right and wrong. While the vast majority of Rolex models come with an average of 13 links, it can vary between 11 and 15 links.
Oyster bracelet come most often with 13 links and may vary from 11 to 15 links.
Jubilee and President bracelets come with 22 links, excluding the end links.

Oyster Bracelet
This bracelet come with 12 links and one end link, designed using flat 3 pieces links is the most often used on professional watches like Submariner, Explorer, GMTs, Air-King, Sea-Dweller and Milgauss.
One cool option on recent model on clasp is the Easylink extension system very useful when the weather impact your wrist circumference by few millimeter.

Jubilee Bracelet
The jubilee bracelet is probably more comfortable to wear than an oyster. Initially landed on the Datejust in 1945. The bracelet has 22 links as well as 2 end links. As for Oyster, Jubilee with Easylink extension system provides the option of 5mm to size it at your convenience.

President Bracelet
The President bracelet, created in 1956 features 22 links as well as 2 end links. It is only available on Day-Date models with precious metals and certain ladies Datejust. Some people mixing it with the Jubilee but it is not, this bracelet features semi-circular three-piece links and is always fitted with a Crownclasp.

Number of links on current models :

Rolex Model	Link Count
Air-King	12 + End Link
Cosmograph Daytona	12 + End Link
Datejust	Oyster: 12 + End Link Jubilee: 20 + 2 End Links
Lady-Datejust	Oyster: 12 + End Link Jubilee: 20 + 2 End Links
Day-Date	22 + 2 End Links
Explorer	12 + End Link
GMT-Master II	Oyster: 12 + End Link Jubilee: 17 + 2 End Links
Milgauss	12 + End Link
Oyster Perpetual	12 + End Link
Sea-Dweller	12 + End Link
Sky-Dweller	Oyster: 12 + End Link Jubilee: 17 + 2 End Links
Submariner	11 + End Link
Yacht-Master I & II	12 + End Link