I sent a PhD application almost 3 weeks ago on a thursday afternoon. As it happened, the next friday was a holiday. Something I noticed after sending the application.
Does one get a notification of receipt after sending an application?
My fear is that I sent the e-mail on thursday, when the PI and professor were already out. That, together with the 3 day weekend, and the mountain of mails probably coming on monday, buried my application and it went unnoticed.