Fermentation timing

Pan de Cristal — Timing by Kitchen Temperature

Baseline: 4h bulk + 1h proof at 76°F. Adjust for your kitchen below.

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The full Pan de Cristal schedule (76°F baseline)

Pan de Cristal is a hearth-style sourdough from Spain (Catalonia). From a ripe levain to a cooled loaf it runs about 6.6 h of dough-day time on top of a ~5-hour levain build. Every duration below is the 76°F baseline — scale it with the temperature table lower down for your own kitchen.

Stage-by-stage Pan de Cristal schedule at 76°F
StageDurationElapsed from mix
Levain build to peak (before mixing)~5 h−5 h
Autolyse (flour + water rest)builds extensibility before the levain goes in30 min30 min
Mix — add levain & salt18 min48 min
Bulk fermentation with stretch-and-folds3–4 sets of folds in the first ~2 hours, then leave it to rise4 h4.8 h
Pre-shape & bench rest24 min5.2 h
Final shape12 min5.3 h
Final proof (room temperature)1 h6.3 h
Bake — 500°F in a sheet panabout 20 minutes18 min6.6 h

A sample same-day clock plan

One realistic way to fit Pan de Cristal around a normal day, at ~76°F. Shift the whole thing earlier or later to suit — only the gaps between stages matter.

  • 7:00 AM — feed the levain (peaks in ~5 h).
  • 12:00 PM — Autolyse.
  • 12:30 PM — Mix.
  • 12:45 PM — Bulk fermentation with stretch-and-folds.
  • 4:45 PM — Pre-shape & bench rest.
  • 5:09 PM — Final shape.
  • 5:18 PM — Final proof.
  • 6:18 PM — Bake.
  • 6:38 PM — loaf out of the oven; cool at least 1 hour before slicing.

Reading each stage by feel

The clock is a guide; the dough is the real timer. Levain is ready at its peak — domed and just starting to recede, floating in water. Bulk is done at a 50–75% rise with a bubbly, jiggly, domed mass — under-shooting gives a tight crumb, over-shooting a slack, gummy one. Proof is judged by the poke test: a slow, partial spring-back. Watch a warm kitchen closely here — the 1 h room proof shortens fast above 78°F.

Temperature × time table

Kitchen tempMultiplierBulk (h)Proof (h)
62°F2.20×8.82.2
68°F1.58×6.31.6
72°F1.23×4.91.2
76°F1.00×4.01.0
80°F0.78×3.10.8
85°F0.56×2.20.6

Calculator pre-set to Pan de Cristal

Multiplier at 76°F
1×
Adjusted bulk ferment
4 h
Adjusted final proof
1 h
How the math works

Multipliers are piecewise-linear interpolations between reference points measured by Myhrvold et al. in Modernist Bread vol 3. 76°F is the baseline (1.0×); every 10°F drop roughly doubles fermentation time, and every 10°F rise roughly halves it.

Pan de Cristal timing — FAQ

How long does Pan de Cristal take start to finish?

Plan on a ~5-hour levain build first, then about 6.6 h of dough-day work at a 76°F baseline. Warmer kitchens run faster and cooler ones slower; use the temperature table below to re-time every stage.

How long is the Pan de Cristal bulk ferment?

4 h at 76°F. It's done when the dough has risen 50–75%, domed, and jiggles when you shake the container — not strictly at the 4 h mark. Multiply by your kitchen's temperature factor (table below) to re-time it.

Can I cold-retard Pan de Cristal overnight?

Yes — after shaping, refrigerate the loaf 10–16 hours instead of the 1 h room proof, then bake cold straight from the fridge. Cold retard deepens flavour and makes scoring cleaner, and it lets you split the bake across two days.

When is Pan de Cristal fully proofed and ready to bake?

Use the poke test: flour a finger, press ~1 cm into the shaped loaf. Ready dough springs back slowly and only partway, leaving a slight dent. Instant spring-back = under-proofed (give it more time); no spring-back and a dense feel = over-proofed (bake immediately, next time shorten the proof).

Sources: Myhrvold et al., Modernist Bread vol 3 (temperature multipliers); Catalan bakery tradition — Pan de Cristal formulas.

The gear that makes the math work

A short, honest baking kit. The scale matters most — every weight on this page is in grams. The Dutch oven is what turns a good crumb into a great crust.

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  • Digital kitchen scale (0.1 g)Digital kitchen scale (0.1 g)

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Or learn the craft by ear

The numbers here are the what; a good baking book is the why. An Audible trial gets you any title free — Michael Pollan’s Cooked(the “Air” chapter is the best story ever told about why bread rises) is a perfect first listen.

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