You can let them go much longer than that prState. In theory, they can be safely discharged down to 1 volt without damage, but it's best not to let them go much below that or there's a risk they might refuse to accept a new charge.
I would run them on, checking from time to time for when they drop to almost 1 volt each cell. You might just be lucky and get one month, and then only have to remember to charge at the start of each month which would be ideally convenient. If not, perhaps settling for roughly two weekly, start and mid month would be fairly convenient.
Hope that's some help.
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