I always recommend slow ranking since it will allow you to have better tech than fast rankers at a given level. But once you get to the point where the ship-bots you draw are sufficient to maintain your deck requirements, then you can really slow down. By this time you should also be getting a good number of androids (helsman and scientist) so you'll be able to put your rank points into tacts and engineers. Its really hard to give a reasonable timetable for this, but most people recommend you stop using rank points for decks between 2500 and 3000 decks.
Hope this helps you.
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[20:40] Wredz: just hacked a massive extremely rich minting planet from someone.. thats the best planet i ever hacked
[20:43] DarthFlagitious: is it spearmint or peppermint?