I take it you have 29 days to play with?

For any week bid at 11 days or greater, you have to be able to hold the subsequent week(s). You only need to hold the one week and get a 10 day block.

You can't leave days left over; they'll just assign left over days (gooned up or forgot to bid).

You could bid 10 days on the last week (or first week) and slide it to "straddle" or cover the 2 months in question. Then you can expand into both months up 66 total hours (watch out for Intl rules, Dec to Nov and Jan to Dec slide restrictions).

You could bid a 7 days in last week (or second to last) and then on next round depending on the month and slots left, bid 7 days first, second or third week and then bid your month to have the days off near the start of the month.

You could bid 10, 10, 9 or 8, 7, 7, 7 or 29, or 19, 10, etc. Split them to add to 29 with smallest block being 7 days.

I'm an 8,7,7,7 man myself

Don't forget you can always trade weeks with someone after all the dust settles.