Sourdough Bulk Fermentation Time at 73 Degrees (73°F / 23°C) with 8% Starter (+61.8% Rise)
Thermal carryover modeling into a 38°F retarder from 73°F (22.8°C) at 8% levain: target +46.4% vertical climb (5.86 cm).
Baking at 73°F (22.8°C) with 8% inoculation (40g starter/500g flour) sets a 10.3–12.9 hour bulk clock before core cooling past 44.8°F. Aim for +61.8% true volumetric expansion (+46.4% vertical height rise in a sloped bowl to 5.86 cm) and avoid the +84.7% volume explosion of doubling height.
- Estimated Bulk Time
- 10.3–12.9 hrsAt 73°F (22.8°C) with 8% starter (Q10=0.86x)
- Target Aliquot Volume Rise
- +61.8%Capped volumetric cutoff (<44.8°F dormancy)
- Sloped Bowl Height Target
- 5.86 cm+46.4% vertical climb from 4.0 cm
- 2x Height Trap Warning
- +84.7% VolCoil fold every 36m (LAB 4.8:1)
Bulk Fermentation Time & Bowl Geometry Matrix Around 73°F (22.8°C) & 8% Starter
5-point neighborhood comparison around 73°F (22.8°C) and 8% starter (40g/500g flour), showing window hours, conical height rise %, straight-wall volume rise %, and 36-min coil fold intervals.
| Temp & Levain Seed (Around 73°F / 8%) | Fermentation Window | 9" Conical Height Rise | Straight-Wall Volume Rise | Coil Fold Cadence |
|---|---|---|---|---|
| 71°F (21.7°C) @ 6% (30g) Cooler / Lower Seed | 14.8–18.5 hrs (888–1110m) | +52.8% height (4.0 → 6.11 cm) | +71.2% vol (2x trap: +99.3%) | Every 39 min (Row 1) |
| 73°F (22.8°C) @ 6% (30g) Baseline Temp / Lower Seed | 12.7–16 hrs (762–960m) | +46.6% height (4.0 → 5.86 cm) | +62.1% vol (2x trap: +85.1%) | Every 37 min (Row 2) |
| 73°F (22.8°C) @ 8% (40g) [Current Target] | 10.3–12.9 hrs (618–774m) | +46.4% height (4.0 → 5.86 cm) | +61.8% vol (2x trap: +84.7%) | Every 36 min (Row 3) |
| 73°F (22.8°C) @ 11% (55g) Baseline Temp / Higher Seed | 8.1–10.2 hrs (486–612m) | +46.1% height (4.0 → 5.84 cm) | +61.4% vol (2x trap: +84.1%) | Every 35 min (Row 4) |
| 75°F (23.9°C) @ 11% (55g) Warmer / Higher Seed | 7–8.6 hrs (420–516m) | +38.9% height (4.0 → 5.56 cm) | +51.1% vol (2x trap: +68.6%) | Every 33 min (Row 5) |
Live Parameter Solver for Sourdough Bulk Fermentation Time at 73 Deg
Dial in custom baker's percentages and export your adjusted 10.3–12.9 hrs formula for bake day.
When to Stop Bulk Fermentation at 73 Degrees (73°F / 23°C): Target +61.8% Rise
At 73°F (22.8°C), a 8% levain inoculation drives CO2 saturation across a 10.3–12.9 hr kinetic window (Q10=0.86x). Because a 24 cm sloped bowl widens quadratically with elevation z, a +61.8% volumetric target equals 5.86 cm (+46.4% height), whereas 8.0 cm height triggers a +84.7% collapse.
Surface tension generated during shaping at 73°F (22.8°C) must withstand both 8% levain gas pressure and the cooling transition to 44.8°F. By capping bulk at +61.8% volumetric expansion (5.86 cm / +46.4% height at 10.3–12.9 hrs) with 36-min folds, blisters form cleanly without collapsing.
4-Stage Bench & Cold-Retard Protocol for 73°F Dough at 8% Starter
- Seed & Thermal Check (73°F / 22.8°C): Verify dough core reads 73°F after incorporating 40g active levain (8% baker's math) for a 4.8:1 LAB balance.
- Aliquot & Sloped Vessel Setup: Place 40g dough in a straight cylinder (mark +61.8%) and set a ruler at 5.86 cm (+46.4% climb) on your 24 cm sloped bowl.
- Gluten Alignment (36-Min Intervals): Perform gentle folds every 36 minutes without degassing; stop folding 90 minutes before hour 10.3.
- Bench Preshape & 38°F Retard: Dump onto the bench between 10.3 and 12.9 hours at +61.8% rise, tension-roll, and refrigerate immediately until core drops past 44.8°F.
Cereal Chemistry & Bench Execution FAQs
What is the Q10 metabolic speed factor at 73°F (22.8°C)?
At 73°F (22.8°C), sourdough yeast and LAB operate at a 0.86x Q10 velocity relative to 75°F, yielding a 4.8:1 lactic-to-acetic acid ratio over 10.3–12.9 hours at 8% starter.
How does 8% starter affect sourness and lactic-to-acetic ratio at 73°F?
Fermenting with 8% levain at 73°F (22.8°C) produces an estimated 4.8:1 lactic-to-acetic organic acid ratio across 10.3–12.9 hours before shaping at +61.8% rise.
Can I cold-retard a 73°F (8% starter) dough for 16 hours after bulk?
Yes—provided you terminate bench fermentation at +61.8% true volumetric expansion (5.86 cm sloped height) after 10.3–12.9 hrs so thermal carryover to 44.8°F does not overproof the gluten.