Yes!! If you have flexibility, you don’t have to microcycle at 7 days. 8, 9 or 10 days can be effective. It just doesn’t work for most people with the constraints of a job, school, family, etc.
When I stop working full time, I’m planning on adjusting to a longer microcycle so I can experiment with it and have additional tools to program for athletes.
That said, 4x threshold even on a 9 or 10 day microcycle is probably still too much to sustain for more than one or two “weeks” IMO.