As the salt and lemon soak into the chilies, the chilies will release liquid. The water level in the jar will go up. Shake it after a couple of days to make sure the chilies are completely covered in oil. After the first 2-3 days, if you want to preserve the pepper in the jar at room temperature, you can fill the jar to the top with oil so there is no oxygen and the chilies are fully submerged. This will preserve them for 3-6 months. It is not necessary to do this, however. After the two days on the counter, if you plan to use it right away, you can keep it in your fridge and it will be stay good for a month.