"Gebser sees integral time concretion as the point where consciousness folds back on itself and integrates the whole" (179) (my emphasis, see this thread).
"Wilber tends to swing between a primarily linear developmental model—albeit one that
includes higher stages beyond the formal, mental mode—and the spiritual Timelessness of the
non-dual. Sometimes, he brings both voices through in the same piece of writing, as indicated
above. However, it is unclear whether Wilber sees Timelessness as being synchronous with
Gebser’s origin. It appears likely that for Wilber this is an endpoint to be strived for rather than
something that can be experienced as a concretion of all the temporicities" (180).
Btw, here's Balder's blog post on triple-loop time, TSK and Torbert.