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.
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