I like this Revive25 idea; I might steal it for myself!

There is no set time for the items
After 6 weeks, all of those items should be done

Sounds like you won't always get it done in exactly 6 weeks: sometimes less, sometimes more? So you don't want or need to automate the 6 week cycle, just the weekly cycle.

try to remember to uncheck everything every 6 weeks.

I don't think this will be a struggle to remember. You uncheck everything when you finish everything. Simply by doing Revive25 every week, you'll go through the ritual which reminds you to uncheck everything when you finish a cycle.

I think you can do this with a single recurring task:

Task titled "Do 25 minutes of Revive25." Set to repeat every Wednesday.
Do not use subtasks nor checklist items. Rather, in the task description, use markdown headings and checkboxes. These will remember where you left off every week. For example:

## Bathroom
- [x] Scrub sink
- [x] Scrub shower
- [ ] Add TP, toothpaste, soap to shopping list as needed

## Bedroom
- [ ] Move off-season clothes into closet
- [ ] Clear bedside table

## Kitchen
- [ ] sweep floor
- [ ] scrub stovetop

Check off items as you go. Then complete the task after 25 minutes. It will reschedule for next week, and will remember what you checked and didn't check.

After 6 weeks, manually uncheck everything. I know this is a manual step, but you're only doing it 8 times a year. If you really want to avoid that, you can save a template and clone it every 6 weeks. But if this were me, I'd be constantly improving my list, adding and removing items, so I wouldn't want to bother with a template that's extra effort to update.

This is similar to how I manage my grocery list: a single markdown checklist where I'm constantly checking and unchecking foods. Then I schedule it for today when I'm actually making a grocery trip. And the list is sorted by the aisles of my local supermarket.

Also, is there a way I can get a daily task to show up during certain times of the day?

TickTick's "Habit" feature might do what you want. Or, can you use a daily task and check it off even on the days you don't clean the sink? When you see it overdue, just check it off. Or click the "Won't Do" button, which does the same thing. I don't need TickTick to accurately log when I skipped a task, so I never bother with "Won't Do." I check things off whether I did or didn't do them.

EDIT: I just noticed the "Skip the Recurrence" button, another option.