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.
How many years will a normal avocado tree produce fruit? As far as I know, an avocado tree will continue to grow and produce fruit until something kills the tree. The origional Hass tree (1926) is still alive and producing fruit. There are some wild trees in Mexico that are over 400 years old that are still producing.