Processing time refers to the duration that you have choosen to provide you with your visa. Since most of the people prefer to stay on the safer side, they try to ensure that they get the document at least a week before their departure, but if somehow you miss it, then rest assured that you can get it within 2-days of application, as well. So, you can choose the time duration under which you require the visa, and they will send it to your email address immediately.