I like the third week, as you should have a fair amount of muff to dab pollen on. One thing, turn off your fans before you apply pollen to a single branch, or your whole grow will be pupped.
depend on the plant. Usually need to wait at least 18 days- that should make the seeds ripe by day 60. They should look something like this. Make sure you tag the pollinated branch so you can find the seeds.
Nice! I'm going to dust some pollen this Wednesday. They will be exactly at the three weeks in flower mark. Buds are getting a bit bigger now. Just doing a couple bud sites.
Where did you get it from and how did you store it? 2 years old is definitely pushing things even in good storage conditions. Pollen doesnt do well with fluctuating temperatures and humidity, if it was stored frozen and then shipped in summer for instance, then the viability will be significantly lower. I have used pruchased pollen in the past and also had a poor experience, however not all was lost and I did manage to harvest some seed although it was maybe 1/10th the number of seeds it should have been. There may still be hope but I personally avoid purchasing pollen now.