I have 5 longan trees in my garden.
1. Normal brown skin from Central Thailand - fruit 1 time per year - 3 years from grafted tree.
2. Pink skin (Similar to Ping Pong longan but with pink skin instead of brown) from Central Thailand - fruit 3-4 times per year - 1 year from grafted tree.
3. White skin from Vietnam - fruit 3-4 times per year - 3 months from grafted tree. (Maybe this one?)
4. Red skin from Indonesia - fruit 2 times per year - 3 months from grafted tree.