Espresso Running Too Fast or Too Slow? How to Fix Shot Time

The fix: Weigh dose and yield first. Under 20s to 1:2 = grind finer; over 40s = grind coarser. Inconsistent times at one setting = fix distribution and tamp, not grind.

Shot time is espresso's vital sign. If 18g of coffee reaches 36g of espresso in roughly 25–32 seconds, extraction is probably in a healthy range. A shot that gushes through in 15 seconds or strangles itself for a minute isn't just off-schedule — it tastes wrong, sour and thin in the first case, harsh and hollow in the second. Here's how to diagnose and fix both.

#First, measure properly

Time alone means nothing without the other two numbers. Always know your dose (grams of dry coffee), yield (grams in the cup), and time. "My shots run 20 seconds" could be perfect for a 30g yield and disastrous for 45g. Weigh in, weigh out, then read the time. Start the timer at pump start or first drip — either works, just be consistent.

#Shot too fast (gusher: 36g out in under 20 seconds)

The water found too little resistance. In order of likelihood:

A fast shot tastes sour, sharp, and thin — the water raced through before dissolving the sugars. If your fast shot somehow tastes good, enjoy it; time is a diagnostic, not a goal.

#Shot too slow (choker: barely dripping at 40+ seconds)

Too much resistance:

A slow shot tastes bitter, harsh, and dry, often with a burnt edge — the water spent too long stripping the grounds.

#Fast AND inconsistent: it's the prep, not the grind

If the same setting gives 22 seconds today and 35 tomorrow, stop turning the grind dial — the variable is your puck preparation. Make every shot identical:

1. Weigh the dose to ±0.1g.
2. Distribute: break clumps and level the grounds (a WDT needle tool is the cheapest fix in espresso).
3. Tamp level with consistent moderate pressure — a tilted tamp creates a thin side that channels every time. Pressure beyond firm doesn't matter; levelness does.
4. Lock in gently — knocking the portafilter cracks the puck.

Consistent prep usually collapses shot-time variance from ±8 seconds to ±2.

#When it's the machine, not you

• Pump pressure: a machine running well above 9 bar compacts the puck and chokes shots; many machines ship at 11–12 bar. If every coffee chokes at reasonable grinds, have the OPV checked or adjusted.
• Worn burrs: dull burrs produce excess fines that clog the puck — if you've been grinding ever coarser over months for the same time, burrs may be due for replacement.
• Scale buildup: descale if flow is weak even with an empty portafilter.

#The fix-it flowchart

1. Weigh dose and yield. Confirm the ratio is actually 1:2 before judging the time.
2. Too fast? Grind finer. Too slow? Coarser. One adjustment, one shot.
3. Inconsistent at the same setting? Fix distribution and tamp before touching the grinder.
4. Time in the window but taste still off? Stop chasing seconds — tune by taste: finer/longer for sour, coarser/shorter for bitter.

Log dose, yield, time, and grind setting for every shot while troubleshooting. Patterns that are invisible shot-to-shot are obvious across ten logged entries.