How long is my form taking?
USCIS publishes a range per form and per office. Both matter — the same form can differ by months depending on where it is being handled.
Forms decided at a local field office, where which office you are assigned to changes the answer by months.
I-526E — Immigrant Petition by Regional Center Investor
35 to 38 months (2.9 to 3.2 years)
Immigrant Investor Program Office
Estimated median
34 months
The published range is the slow tail, not the middle: USCIS's low figure is where about 80% of cases have finished and the high figure about 93%. So half of cases finish sooner than 34 months — three in four by 34.9, nine in ten by 37.7. An estimate from those two published anchors, not a figure USCIS publishes.
Ranges are as published by USCIS: the low figure is where about 80% of cases have finished and the high figure about 93%. Confirm on Check on USCIS's processing times page.