Free espresso timer for pulling perfect shots. Track extraction time from first drip to cut-off. Dial in your espresso like a barista.
I used to think my espresso machine was broken because shots tasted sour or bitter until I learned about the timing window. Turns out if you pull faster than 20 seconds the water rushes through without extracting enough and you get this thin sour mess. Go longer than 35 seconds and you're pulling out all the nasty bitter compounds that ruin the shot. That 25-30 second sweet spot is where all the good flavors come together - the sweetness body and just enough acidity without any harshness.
When my shots were pulling in 15 seconds I thought I needed a new machine but really I just needed to grind finer. Too fast means grind finer or use slightly more coffee maybe half a gram more. Too slow and you're choking the machine - grind coarser or use a tiny bit less coffee. I learned to only change one thing at a time because when I adjusted grind AND dose together I had no idea what actually fixed it. Most beginners including me don't grind fine enough so start there.
I started with 18 grams in and aimed for 36 grams out in about 27 seconds - that's the classic 1:2 ratio everyone talks about. Some coffees taste better at 1:2.5 with more water or 1:1.5 for a ristretto which is more concentrated. The key is weighing both your dry grounds and your output because eyeballing it is completely unreliable with all that crema on top. Once I got a cheap scale my espresso improved overnight because I could actually replicate good shots instead of guessing every time.
Channeling is when water finds weak spots in your coffee puck and rushes through creating fast uneven extraction. You'll see it as spurting or multiple streams coming from the portafilter instead of one even flow. When it happens you get both sour and bitter flavors at the same time because some coffee is barely touched and other parts are over-extracted. I fixed mine by using a WDT tool just a bent paperclip works to stir the grounds before tamping and making sure I tamp level without any gaps at the edges.
The standard is timing from when you engage the pump not when coffee starts dripping. First drip should happen around 5-8 seconds after you hit the button - this is pre-infusion time where water saturates the puck. If coffee drips immediately in under 3 seconds your grind is way too coarse. If it takes more than 10 seconds to see first drip you're grinding too fine and choking the machine. Total time includes that pre-infusion so from button to stopping should be 25-30 seconds.