Multi-harvest crops have a "cooldown" after harvesting until they start growing. I added this to the wiki a while back: Multiple-Harvest Crops have a cooldown until they start growing again, when harvested or first planted. This cooldown is equal to 50% of their Crop Grow Time multiplied with the amount of not fully grown slots. For example: After harvesting all 6 Lemons of a Lemon Crop, the first Lemon will have 30 min cooldown, the second will have 1 h and so on. This cooldown also applies to Multiple-Harvest Crops with only a single slot.
A formula for the crop size of a crop after harvesting would be (newPlantScale + (totalSlots - harvestableSlots) * 0.5) * baseGrowTime where baseGrowTime is the "Crop Grow Time" on wiki and harvestableSlots excludes the just harvested plant.
As for the values the wiki should be correct, I checked most of the values myself. Also when you plant a multi-harvest crop, the time shown on your fruit will be the matureTime + growTime of the specific crop. So the time shown will always be higher than the matureTime, but the matureTime is consistent and doesn't scale.