Sourdough Bulk Fermentation Time at 73 Degrees (73°F / 23°C) with 30% Starter (+58.5% Rise)
LAB 5.7:1 organic acid balance and 3.8–4.8 hr bulk schedule for 73°F (22.8°C) doughs inoculated at 30%.
Baking at 73°F (22.8°C) with 30% inoculation (150g starter/500g flour) sets a 3.8–4.8 hour bulk clock before core cooling past 44.2°F. Aim for +58.5% true volumetric expansion (+44.1% vertical height rise in a sloped bowl to 5.76 cm) and avoid the +79.7% volume explosion of doubling height.
- Estimated Bulk Time
- 3.8–4.8 hrsAt 73°F (22.8°C) with 30% starter (Q10=0.86x)
- Target Aliquot Volume Rise
- +58.5%Capped volumetric cutoff (<44.2°F dormancy)
- Sloped Bowl Height Target
- 5.76 cm+44.1% vertical climb from 4.0 cm
- 2x Height Trap Warning
- +79.7% VolCoil fold every 29m (LAB 5.7:1)
Bulk Fermentation Time & Bowl Geometry Matrix Around 73°F (22.8°C) & 30% Starter
5-point neighborhood comparison around 73°F (22.8°C) and 30% starter (150g/500g flour), showing window hours, conical height rise %, straight-wall volume rise %, and 29-min coil fold intervals.
| Temp & Levain Seed (Around 73°F / 30%) | Fermentation Window | 9" Conical Height Rise | Straight-Wall Volume Rise | Coil Fold Cadence |
|---|---|---|---|---|
| 71°F (21.7°C) @ 28% (140g) Cooler / Lower Seed | 4.7–5.8 hrs (282–348m) | +50.3% height (4.0 → 6.01 cm) | +67.4% vol (2x trap: +93.3%) | Every 32 min (Row 1) |
| 73°F (22.8°C) @ 28% (140g) Baseline Temp / Lower Seed | 4–5.1 hrs (240–306m) | +44.3% height (4.0 → 5.77 cm) | +58.8% vol (2x trap: +80.1%) | Every 29 min (Row 2) |
| 73°F (22.8°C) @ 30% (150g) [Current Target] | 3.8–4.8 hrs (228–288m) | +44.1% height (4.0 → 5.76 cm) | +58.5% vol (2x trap: +79.7%) | Every 29 min (Row 3) |
| 73°F (22.8°C) @ 33% (165g) Baseline Temp / Higher Seed | 3.5–4.5 hrs (210–270m) | +43.8% height (4.0 → 5.75 cm) | +58.1% vol (2x trap: +79.1%) | Every 28 min (Row 4) |
| 75°F (23.9°C) @ 33% (165g) Warmer / Higher Seed | 3.1–3.8 hrs (186–228m) | +37% height (4.0 → 5.48 cm) | +48.4% vol (2x trap: +64.7%) | Every 25 min (Row 5) |
Dynamic Stoichiometric Workbench (3.8–4.8 hrs)
Test custom loaf weights or alternative fermentation schedules directly against the +58.5% benchmark above.
When to Stop Bulk Fermentation at 73 Degrees (73°F / 23°C): Target +58.5% Rise
Endogenous cereal protease (aspartic proteinase) cleaves disulfide-linked glutenin macropolymers at a Q10 rate of 0.86x when dough sits at 73°F (22.8°C). Under a 30% levain load, extending bulk past 4.8 hours or beyond 5.76 cm (+44.1% height / +58.5% volume) risks irreversible slackening toward the +79.7% conical trap.
Surface tension generated during shaping at 73°F (22.8°C) must withstand both 30% levain gas pressure and the cooling transition to 44.2°F. By capping bulk at +58.5% volumetric expansion (5.76 cm / +44.1% height at 3.8–4.8 hrs) with 29-min folds, blisters form cleanly without collapsing.
4-Stage Bench & Cold-Retard Protocol for 73°F Dough at 30% Starter
- Quantitative Weigh-In (30% Seed): Measure 150g bubbly 100% starter into your 500g flour batch and confirm a 73°F (22.8°C) post-mix temperature.
- Timed Coil-Fold Window (29 Mins): Space 3 to 4 coil folds at 29-minute intervals while Q10=0.86x kinetics build alveolar tension.
- Sloped-Bowl Readout (5.76 cm Target): Watch for domed shoulders at 3.8–4.8 hrs when bowl depth climbs +44.1% to 5.76 cm (+58.5% true volume).
- Overnight Retardation (<44.2°F): Shape with minimal flour and cold-proof 12–16 hours at 38°F as core temperature crosses the 44.2°F dormancy line.
Key Baker's Math Questions (Estimated Bulk Time: 3.8–4.8 hrs)
At what internal temperature does a 73°F dough stop rising in the fridge?
When transferred from 73°F (22.8°C) to a 38°F refrigerator at +58.5% volume (5.76 cm bowl height), wild yeast budding tapers into dormancy once the core cools below 44.2°F.
What percentage rise should I look for at 73°F (22.8°C) with 30% levain?
Target +58.5% true volumetric expansion (+44.1% vertical height rise in a sloped bowl, from 4.0 cm to 5.76 cm) before 38°F cold retarding, avoiding the +79.7% volume explosion of doubling height.
How does 30% starter affect sourness and lactic-to-acetic ratio at 73°F?
Fermenting with 30% levain at 73°F (22.8°C) produces an estimated 5.7:1 lactic-to-acetic organic acid ratio across 3.8–4.8 hours before shaping at +58.5% rise.