How long can I retard for

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Recipe 

255g levain @ 50% hydration  (80% bread flour, 20% whole rye) 

241g bread flour

66g whole wheat flour

243g water

8g salt

 

If I get this into the fridge after the bulk ferment on Wednesday evening can I bake it on Friday evening? 

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Seems like a long time, but i don't know if it's too long or not. 

The longest I've retarded for is 19 hours.

I'm very interested to see how it turns out if you try it. 

Sorry i can't  be more helpful.

Thanks! My schedule did change and managed to bake without any retard but good to know.

I'm more confident with retarding at the final proofing stage as doing so in the bulk ferment stage throws me off. But with such a long retard and doing so at the bulk ferment stage one can simply bring it back to room temperature, shape and final proof.

I wonder, apart from it fitting into your schedule, what would be the advantage of retarding in the bulk ferment stage. Final proofing stage I do for flavour and it is a bit of a failsafe when it comes to judging when it's done. But with the bulk ferment stage I'm not quite sure when it would be done and is there any difference in flavour?