You should be able to bake bread with your starter, on average, in about 10 days. Maybe your mix of circumstances will allow you to do so earlier. People in sourdough communities online often wrote about starters that were very active on day 3 and day 4, then they got very sluggish and picked up again on days 12, 15, or even 20, stronger than ever! But a rule of thumb is that you should start to see at least some activity in the first 7 days. If you don't, try to switch up your flour, feeding amounts, or feeding frequency (we will talk more about all that later). You could also find a warm place for your starter if you have a feeling the temperature in your home is a bit low.