If it is the most vigorous limb, I've gotten away with 7 T-buds maximum for citruses. Most of the time, only 3, the others will not sprout.
In Cherries, I've gotten away with 12 combo of T-buds or Chip buds on a single limb, which was the main trunk when it was small. Cherries are a lot easier to do, very long straight limbs. The resulting budding became a fan-like type of arrangement in my tight space. Through time, the 4 others remained stunted, there are only 8 that are more or less uniform limb coming from the budded union. Well those 8 limbs have other varieties now.