That depends on the hobby you're monetizing, I think. For instance, one of my hobbies is watchmaking (cleaning, servicing, restoring). I don't do it for money,

That depends on the hobby you're monetizing, I think. For instance, one of my hobbies is watchmaking (cleaning, servicing, restoring). I don't do it for money, but those who do don't really adhere to deadlines. It's all very open ended, even for the large companies like Seiko and Rolex. They don't guarantee a timeframe, and you won't know how long they'll have it until they tell you they're sending it back. I think this is partly because these are generally considered luxury items rather than necessities, but also partly because many regard the inner workings of a mechanical watch to be magic.