I just did a several-day meditation retreat. It was wonderful, and I came out of it completely energized to practice. I would absolutely recommend taking any amount of retreat time you can manage--it's one of the best things you can do for yourself.
I'm back in a fairly stressful situation now, and I can see those stresses gnawing away at my practice. So (for my own benefit and everyone else's) here are a few thoughts on doing a post-retreat correctly:
• When you get out of it, continue to sit twice a day, morning and evening. It's really important to carry forward the practice momentum you've had.
• As a way to keep it a priority in a busy schedule: Notice how you feel during and immediately after a retreat, and think of that as being the result of meditation (which it is!). So, if after the retreat something comes up that threatens to interrupt your practice schedule, ask whether the thing is worth risking the benefits of practice for. Maybe it is, but at least you'll recognize the tradeoff you may be making.
• Don't worry too much about "holding on" to whatever benefits you feel in retreat. Some of these are just temporary excitements that only exist in a retreat environment and are bound to wash away anyway; and the things that really are lasting, valid insights will be difficult to access if you're worried about clinging to (your idea of) them. What you should hold onto is the practice itself.
Hope that's helpful! I better go practice soon...