Well, having already a working process, speeding it up will be easier. In nature, you don&#x27;t really have dedicated nanoassemblers that do only structure scaffoldings with no other considerations - they have to support a whole organism. So when, for instance, growing a skeleton, you need it to go slow enough that the more complex parts like veins and nervous system can keep up. But if we needed biology to grow us a particular object, we can learn how to put the relevant process on overdrive and ditch the rest.<p>Also, even if the initial version of nanotech worked as fast as tree grows, you could still put <i>a lot</i> of products in parallel, so for most intent and purposes, after few months of waiting, you&#x27;ll be getting new copies daily. We do that a lot with traditional manufacturing today.<p>&gt; <i>But, you know, it takes billions-of-years evolved plantlife about 20 years...</i><p>Well, evolution is <i>really stupid</i> and really slow. Having brains, we can now iterate many orders of magnitude faster, so I wouldn&#x27;t worry. Comparing things to evolution is comparing to the simplest and dumbest possible process imaginable that still works.