The competition for roles as a medical science liaison is very tough, as with most non-clinical roles for former clinicians or scientists. Clinical roles are almost always easier to obtain than non-clinical, due to supply and demand.
Requiring the longest maturity time, the Guatemalan avocado needs 15 to 18 months to change from its flowering blooming period to a full harvest. On average, the tree blooms in March and April, but will not be ready for harvesting until the year after between September through January.
If you buy a variety grafted onto a rootstock from a nursery, you will likely get your first avocados from three to five years after you plant it. If you plant a seed, it will likely take five to 13 years. It's natural for the first flowers to drop from the tree without setting avocados.