For a long time; since long ago; already — indicating something known or planned well in advance.
その店に行きたいと思っていたのは前々からだ。
I've wanted to go to that shop for a long time.
前々から予約しておけば、当日慌てずに済む。
If you book well in advance, you won't be rushed on the day.
彼のことは前々から知っているが、話す機会がなかっただけだ。
I've known him for quite some time; it's just that I haven't had a chance to talk to him.
その計画は前々から温めていたアイデアだ。
That plan is an idea I've been developing for a long time.