Given that these are one of a kind portraits, it is important for me to meet the subject in person. If it is an animal, I will take photographs for reference as it is difficult for creatures to hold a pose for an extended amount of time. If the portrait is of a human, I prefer to have them sit for the portrait. For this they need to be able to sit completely still for several hours, a challenge worthy of a portrait in itself these days.
As a physical meeting is not always possible, I am flexible and will work with you to figure something out.
It depends on many factors. Is there a blizzard or lots of rain? Can I find my pencil? I do my best to work within your stated time frame. All good things take time.