My own experience is : Seeds have a very large life , will even germinate after several months just laying around , normally germination is after 1 month .
A few years ago I send 350 seeds to India , almost 100% germination was reported later . Some of the seeds I mailed this year arrived germinating ( a little bud showing )
Over the next couple of months the plant grows slow but steady , one year olds should be about 20 to 25 cm tall. ( no special soil and regular watering once a week , not during the rainy season July trough October , since I have lots of plants I kinda neglect them forgetting to water sometimes during more than a month , they are not affected by this , but seedlings ( very long taproot ) planted in a 25 cm wide and 50 to 60 cm deep container with improved soil , regular fertilizing and coffee grinds added really thrive and are almost double the size .
I got good feedback from super wet locations ( New Guinea ) and from super dry locations ( Dubai )
Bonakion , your plants should be a lot bigger now ....