We are doing Bigger and doing a 4 day week with it. My older two are in 4 day programs, we have a co-op on every other Friday,and my older two have other activities on Fridays, so as the youngest in line, I had to make some adjustments or I would feel like we were always behind or worse, not get to the day 5 stuff at all. It hasn't been a big deal since I don't just load up one day with the extra work. While not ideal, and not the way the guide is written, it is what has worked well for my family.
The way I make this work is
I do the timeline activity from day 5 on day 1 of the next week as a review of what we had covered before moving on. It helps us get us back into the history mode and opens the week with good conversation.
The poetry on day 5 is for them to pick a prior poem to review. We do that on day 4 after we've done day 4 poetry. That never seems like a chore as she loves going through her poetry collection (she does copywork with the poems so she is very proud of her poetry book so she picks her poems to read aloud from that.) She will often do that during our lunch break.
The Bible study on day 5 is usually done that night before bed, which is a nice way to end our week. It doesn't really seem like schoolwork anyway.
We don't do day 5 of the music, but to be fair, that music CD gets played ALL.THE.TIME, so I don't feel we are short changing anything there.
Day 4 science is a reading/narration so we do that and then go right into the Day 5 science seamlessly. That sometimes makes Thursdays a little longer, but I carve that day out as a stay-at-home day so we have the time.
For the Storytime, we are always ahead of schedule on those books so missing day 5 isn't an issue.
For math and reading, she sometimes does that on the way to/from our co-op as it is a half hour drive each way, depending on if she needs any instruction. Otherwise we do that when we get back from co-op.
For cursive, that page gets added to Day 1 of the next week, so she has 2 pages to do on Mondays only. Same with the English. We just double up on the English lessons, and since we do much of that orally, that isn't an issue.
The things that make doubling up hard is the history project on day 4 and the notebooking on day 5. I don't want to rush either of those, so we sometimes do one or the other in an evening. This allows her to tell Dad all about her history week and lets him get in on some of the fun.
So, like I said, it isn't ideal nor is it how the guide is intended, but given the dynamics of our home, I feel doing it this way allows for everything to get done without adding stress to our home or taking away the enjoyment of learning. I am looking forward to next year when everyone will be on a 4 day schedule. No tweaking required!
I've done all the guides now with at least one child and still feeling the HOD LOVE. LOL!
DD 9- Preparing
DD 13- Rev 2 Rev
DS 15- Geography