Sounds like 30 pounds should be no problem. With some judicious gear choices, you can carry fairly “traditional” (as opposed to ultralight) gear and still be under 25 pounds for a weekend; that leaves you 5 pounds for an extra 3 days of food and a change of clothes, and you’re easily under 30 pounds for five days or a week.

You may feel a bit of soreness as muscles re-acclimate to a slightly different center of gravity, the extra weight, and a snug hipbelt, but it will be more an oh-by-the-way feeling than a what-do-you-mean-do-this-again-tomorrow rebellion.

Relax, don’t worry about the physical challenge, and have a great time! (And one additional warning - just because everyone says “fast and light” like you must do both, “slow and light” is also acceptable.)