I don't consider what we do rigorous but here is my 6th grader's typical day:
Bible with everyone
Chalkdust Basic Math-watch DVD & 25ish problems per day
R&S English 6-1 lesson
IEW Medieval Writing-works throughout the week on 1 lesson
SWR-M and W
Apologia General Science-reads a few pages, answer any OYO and do the experiments. Right now he is doing a module per week.
TOG-he reads core Th & does map, In Depth F, Lit S/S, M & T, M answers SAP pages and T answers lit pages. Wed discussion
Henle-one lesson per day M-Th, per Memoria Press Guide