haven't seen you in a long time
A phrase used when one encounters someone after having not seen them for a long period of time. Hey, Al, haven't seen you in a long time! How have you been?
(I) haven't seen you in a long time.
Fig. an expression of greeting, often said as part of a series. Mary: Hi, Fred! Haven't seen you in a long time. Fred: Yeah. Longtime no see. Tom: Well, John. Is that you? I haven't seen you in a long time. John: Good to see you, Tom!