The answer to this is - the real world comes knocking. Govt, banking, investment, grocery, transport, even some mainstream social/communication apps, all stop working - yeah, kinda cold turkey. And if your, or someone else's, answer to them is: ".. well then don't use those apps.. or maybe in mobile or desktop browser.. " (this is usually the tone on those "privacy" guide forums), then yeah it will work and can be done in hours theoretically, or days max :)