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6 weeks is a decent amount of time. I don't know lime very well but I don't think it crystallises like plaster. It would be interesting to know how it hardens. In all honesty I was surprised how little difference it made painting on it using the lime paint. It was a good finish as well. The client told me she didn't need it to look so good! Fun times working for her :) Was a really lovely house. Oldest sash windows I've ever worked on.
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Ask here - it's my goto for that sort of question
Not sure on lime. The last one I did used a special paint for lime. I assumed it was based on lime so it would breath in the same way.