Sourdough Bulk Fermentation Time at 72 Degrees (72°F / 22°C) with 25% Starter (+64.2% Rise)
Q10=0.8x metabolic curve for 125g starter per 500g flour at 72°F (22.2°C): stop at 5.92 cm bowl height (+64.2% aliquot rise).
Baking at 72°F (22.2°C) with 25% inoculation (125g starter/500g flour) sets a 4.7–5.9 hour bulk clock before core cooling past 44.2°F. Aim for +64.2% true volumetric expansion (+48.1% vertical height rise in a sloped bowl to 5.92 cm) and avoid the +88.4% volume explosion of doubling height.
- Estimated Bulk Time
- 4.7–5.9 hrsAt 72°F (22.2°C) with 25% starter (Q10=0.8x)
- Target Aliquot Volume Rise
- +64.2%Capped volumetric cutoff (<44.2°F dormancy)
- Sloped Bowl Height Target
- 5.92 cm+48.1% vertical climb from 4.0 cm
- 2x Height Trap Warning
- +88.4% VolCoil fold every 31m (LAB 5.3:1)
2D Thermal & Inoculation Sensitivity Table for 72°F (22.2°C) @ 25% Levain
5-point neighborhood comparison around 72°F (22.2°C) and 25% starter (125g/500g flour), showing window hours, conical height rise %, straight-wall volume rise %, and 31-min coil fold intervals.
| Temp & Levain Seed (Around 72°F / 25%) | Fermentation Window | 9" Conical Height Rise | Straight-Wall Volume Rise | Coil Fold Cadence |
|---|---|---|---|---|
| 70°F (21.1°C) @ 23% (115g) Cooler / Lower Seed | 5.9–7.2 hrs (354–432m) | +53.4% height (4.0 → 6.14 cm) | +72% vol (2x trap: +100.5%) | Every 34 min (Row 1) |
| 72°F (22.2°C) @ 23% (115g) Baseline Temp / Lower Seed | 5–6.3 hrs (300–378m) | +48.3% height (4.0 → 5.93 cm) | +64.5% vol (2x trap: +88.8%) | Every 32 min (Row 2) |
| 72°F (22.2°C) @ 25% (125g) [Current Target] | 4.7–5.9 hrs (282–354m) | +48.1% height (4.0 → 5.92 cm) | +64.2% vol (2x trap: +88.4%) | Every 31 min (Row 3) |
| 72°F (22.2°C) @ 28% (140g) Baseline Temp / Higher Seed | 4.3–5.4 hrs (258–324m) | +47.7% height (4.0 → 5.91 cm) | +63.7% vol (2x trap: +87.6%) | Every 30 min (Row 4) |
| 74°F (23.3°C) @ 28% (140g) Warmer / Higher Seed | 3.8–4.7 hrs (228–282m) | +40.9% height (4.0 → 5.64 cm) | +53.9% vol (2x trap: +72.8%) | Every 28 min (Row 5) |
Real-Time Dough & Starter Scaling Sandbox
Scale this How Long to Bulk Ferment Sourdough a specification up or down on your digital scale with zero hydration drift.
When to Stop Bulk Fermentation at 72 Degrees (72°F / 22°C): Target +64.2% Rise
At 72°F (22.2°C), a 25% levain inoculation drives CO2 saturation across a 4.7–5.9 hr kinetic window (Q10=0.8x). Because a 24 cm sloped bowl widens quadratically with elevation z, a +64.2% volumetric target equals 5.92 cm (+48.1% height), whereas 8.0 cm height triggers a +88.4% collapse.
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 44.2°F. With 25% starter (Q10=0.8x), cutting off bench bulk at +64.2% volume (5.92 cm / +48.1% height after 4.7–5.9 hrs) prevents cold-retard overproofing.
Precision Bulk Fermentation Workflow: 72°F (22.2°C) with 125g Levain
- Seed & Thermal Check (72°F / 22.2°C): Verify dough core reads 72°F after incorporating 125g active levain (25% baker's math) for a 5.3:1 LAB balance.
- Aliquot & Sloped Vessel Setup: Place 40g dough in a straight cylinder (mark +64.2%) and set a ruler at 5.92 cm (+48.1% climb) on your 24 cm sloped bowl.
- Gluten Alignment (31-Min Intervals): Perform gentle folds every 31 minutes without degassing; stop folding 90 minutes before hour 4.7.
- Bench Preshape & 38°F Retard: Dump onto the bench between 4.7 and 5.9 hours at +64.2% rise, tension-roll, and refrigerate immediately until core drops past 44.2°F.
Diagnostic Answers: How Long to Bulk Ferment Sourdough at 72 Deg
What percentage rise should I look for at 72°F (22.2°C) with 25% levain?
Target +64.2% true volumetric expansion (+48.1% vertical height rise in a sloped bowl, from 4.0 cm to 5.92 cm) before 38°F cold retarding, avoiding the +88.4% volume explosion of doubling height.
How high should dough climb in a 9-inch sloped bowl at 72°F and 25% starter?
Starting at 4.0 cm depth in a 24 cm top / 14 cm bottom bowl, stop bulk at 5.92 cm (+48.1% vertical height rise in a sloped bowl), which equals +64.2% true volumetric expansion.
What happens if my 72°F kitchen warms up by 2°F during a 25% starter bulk?
A +2°F rise to 74°F accelerates Q10 kinetics above 0.8x and shortens the 4.7–5.9 hr window, so monitor the 5.92 cm (+64.2% volume) mark closely.