Sourdough Bulk Fermentation Time at 72 Degrees (72°F / 22°C) with 15% Starter (+65.8% Rise)
Thermal carryover modeling into a 38°F retarder from 72°F (22.2°C) at 15% levain: target +49.2% vertical climb (5.97 cm).
For a 72°F (22.2°C) batch seeded at 15% starter (75g per 500g flour), schedule 6.8–8.7 hours on the bench and fold every 35 minutes. Bench-shape strictly at +65.8% true volumetric expansion (+49.2% vertical height rise in a sloped bowl to 5.97 cm) so you never suffer the +90.8% volume explosion of doubling bowl height.
- Estimated Bulk Time
- 6.8–8.7 hrsAt 72°F (22.2°C) with 15% starter (Q10=0.8x)
- Target Aliquot Volume Rise
- +65.8%Capped volumetric cutoff (<44.5°F dormancy)
- Sloped Bowl Height Target
- 5.97 cm+49.2% vertical climb from 4.0 cm
- 2x Height Trap Warning
- +90.8% VolCoil fold every 35m (LAB 4.9:1)
2D Thermal & Inoculation Sensitivity Table for 72°F (22.2°C) @ 15% Levain
5-point neighborhood comparison around 72°F (22.2°C) and 15% starter (75g/500g flour), showing window hours, conical height rise %, straight-wall volume rise %, and 35-min coil fold intervals.
| Temp & Levain Seed (Around 72°F / 15%) | Fermentation Window | 9" Conical Height Rise | Straight-Wall Volume Rise | Coil Fold Cadence |
|---|---|---|---|---|
| 70°F (21.1°C) @ 13% (65g) Cooler / Lower Seed | 9–11.1 hrs (540–666m) | +54.6% height (4.0 → 6.18 cm) | +73.8% vol (2x trap: +103.4%) | Every 38 min (Row 1) |
| 72°F (22.2°C) @ 13% (65g) Baseline Temp / Lower Seed | 7.6–9.7 hrs (456–582m) | +49.4% height (4.0 → 5.98 cm) | +66.1% vol (2x trap: +91.3%) | Every 36 min (Row 2) |
| 72°F (22.2°C) @ 15% (75g) [Current Target] | 6.8–8.7 hrs (408–522m) | +49.2% height (4.0 → 5.97 cm) | +65.8% vol (2x trap: +90.8%) | Every 35 min (Row 3) |
| 72°F (22.2°C) @ 18% (90g) Baseline Temp / Higher Seed | 6–7.6 hrs (360–456m) | +48.8% height (4.0 → 5.95 cm) | +65.3% vol (2x trap: +90.1%) | Every 34 min (Row 4) |
| 74°F (23.3°C) @ 18% (90g) Warmer / Higher Seed | 5.2–6.5 hrs (312–390m) | +41.9% height (4.0 → 5.68 cm) | +55.3% vol (2x trap: +74.9%) | Every 32 min (Row 5) |
On-Bench Hydration & Fermentation Adjuster
Modify base flour mass, levain inoculation, or ambient kitchen temperature below to recalculate from this 6.8–8.7 hrs baseline.
When to Stop Bulk Fermentation at 72 Degrees (72°F / 22°C): Target +65.8% Rise
Symbiotic lag-phase duration for 15% starter (75g/500g flour) at 72°F (22.2°C) is governed by a 0.8x thermal multiplier and a 4.9:1 lactic/acetic trajectory. Once the dough climbs +49.2% vertically to 5.97 cm (+65.8% aliquot volume) between 6.8 and 8.7 hours, yeast dormancy must be induced below 44.5°F.
Newtonian thermal inertia dictates that a 900g loaf transferred from 72°F (22.2°C) into a 38°F (3.3°C) refrigerator continues fermenting until its core crosses 44.5°F. With 15% starter (Q10=0.8x), cutting off bench bulk at +65.8% volume (5.97 cm / +49.2% height after 6.8–8.7 hrs) prevents cold-retard overproofing.
Precision Bulk Fermentation Workflow: 72°F (22.2°C) with 75g Levain
- Quantitative Weigh-In (15% Seed): Measure 75g bubbly 100% starter into your 500g flour batch and confirm a 72°F (22.2°C) post-mix temperature.
- Timed Coil-Fold Window (35 Mins): Space 3 to 4 coil folds at 35-minute intervals while Q10=0.8x kinetics build alveolar tension.
- Sloped-Bowl Readout (5.97 cm Target): Watch for domed shoulders at 6.8–8.7 hrs when bowl depth climbs +49.2% to 5.97 cm (+65.8% true volume).
- Overnight Retardation (<44.5°F): Shape with minimal flour and cold-proof 12–16 hours at 38°F as core temperature crosses the 44.5°F dormancy line.
Common Scaling & Troubleshooting Questions (6.8–8.7 hrs)
How high should dough climb in a 9-inch sloped bowl at 72°F and 15% starter?
Starting at 4.0 cm depth in a 24 cm top / 14 cm bottom bowl, stop bulk at 5.97 cm (+49.2% vertical height rise in a sloped bowl), which equals +65.8% true volumetric expansion.
Can I cold-retard a 72°F (15% starter) dough for 16 hours after bulk?
Yes—provided you terminate bench fermentation at +65.8% true volumetric expansion (5.97 cm sloped height) after 6.8–8.7 hrs so thermal carryover to 44.5°F does not overproof the gluten.
How many grams of starter is 15% inoculation for a 500g flour loaf at 72°F?
A 15% inoculation on 500g main flour equals 75g of active 100% hydration starter (38g flour + 38g water), fermenting in 6.8–8.7 hours at 72°F.