There's no single right answer, but there is a right way to think about it. VCT and other resilient floors are protected by layers of finish. Grit, salt, and foot traffic wear that finish away; burnishing restores the shine, scrub-and-recoat adds fresh layers, and a full strip resets everything. The schedule depends on how fast the finish is wearing.
In Wisconsin, the biggest factor is salt season. From November through March, entrances and main corridors take a constant load of salt and slush that dulls finish faster than anything else. Good matting and daily dust-and-damp mopping slow it down; without them, a floor that could go a year between strips will need one by spring.
As a rule of thumb: high-traffic retail, schools, and medical lobbies usually need a full strip once or twice a year with a scrub-and-recoat in between. Offices with moderate traffic can often go twelve to eighteen months if burnishing is done monthly. Low-traffic areas may only need a recoat.
The cheapest floor program is the one that does the routine work consistently, because every strip you avoid saves labor, chemicals, and a night of downtime. If you're not sure where your floors stand, have someone check the finish depth and traffic lanes before you book a full strip you may not need yet.