This is getting harder!
31 – first perek of Tehillim in Yom Shaini (I think! If I’m wrong, someone please correct!)
Gematria of ??
Here’s one for 29: the minimum amount of times we say Al HaNisim on Chanuka. Here’s the cheshbon: 3 Shmone Esrei’s times 8 = 24. Plus, Musof on Shabbos, plus at least one more Musof – assuming only one day Rosh Chodesh during Chanuka. That’s 26. Then 3 seudos on Shabbos – assuming you wash for Shalosh Seudos – which you should. That’s 29.
Then if you cheshbon in washing for Melava Malka during Chanuka as well as having a seuda with bread on Rosh Chodesh, you end up with 31! Granted, it can be more, for example, if Rosh Chodesh Teves is 2 days or if you eat more bread meals during Chanuka . . .