I've seen transitions with almost 100. They're very slow, but still work.
On top of the standard five, I would try to avoid adding more than 10-12 simple ones, or 2-3 complex (or dependent on other systems) ones if you want the transition to execute before your people get frustrated and impatient.
From a management point, working through a list of 70 "clever" things someone things they might need to do on a transition is a nightmare. I'd rather have a couple that do some minimal stuff, and one that offloads the rest of the clever things as a single "Oi! This just happened" to some middleware layer.
@Payne - yes, scary, and horrid to try to untangle.
@Andy_J - I have no "simple" guidelines, it is absolutely "what will work for this team". Do what works well for your people (not you as an admin - our job is not to be happy, but to enable other people to work well together, even when that particular config is really bad)
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