Maintaining fruit yeast water, how often to refresh?

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Hi All, 

I just made raisin yeast water and try to bake my first loaf.  I see some topics on maintaining yeast water but I can't about how often should we refresh it.  
Please give advice. Thank you.

There are as many ways as there are for sourdough starter.  I refresh mine whenever I use it - about once every 2-3 months.  Others bake with it all the time and refresh one a week or even 3 times a week.  It is up to you and how often you use it,