Partly it depends on where you get it implanted, whether they use leads or paddles & how quickly you tend to heal. I usually have a higher than normal SED rate (blood test that measures inflammation) so I heal slower than average. I was cleared to fly out to my gma's within 2-3 weeks but had to manage the traveling carefully -- NO lifting suitcases, duffle bags, etc. John makes a good point that if your stitches have been removed you will need to apply high SPF sunscreen. If they haven't been removed before your trip, you will need to talk to your doc about wound care.
If it were me, I'd plan a visit to the doc just before the trip to be sure everything looks okay. Also, realize that some people need to undergo months of rehab before their SCS works well so you may not be getting much relief at first from the unit. Be prepared for the airport screening process. I've found I can't be on my feet & walking around for so long (I live near one of the largest international airports, so there is a lot of walking & waiting involved). You can all the airline ahead of time to make arrangements for accompanied transport (manual wheelchair or indoor tram) and that can make things easier on you. You can always cancel at the last minute, but if you don't plan ahead it's hard to get one without a few days prior notice.
Also, I've cut way back on meds post-op, but it took months to get to that point. I went up on my meds for the first 3-4 months. Then, slowly went down. Now, it's 5 years later & the SCS is good for nothing but we've found other ways to manage my pain & I am still on a low dose. :)
Mostly, I would say to listen carefully to your doc's instructions. Those matter much more than any of our experiences. I was on restrictions for 6 months due to my own medical issues. Other people who see my same PM are only on restrictions for 8 weeks. Your doc will know about your general health, any issues related to healing, what exact procedure he plans to use, how much medicine you're on, whether you'll be sedated for the implant, what unit you're getting & a whole host of other issues that can impact what restrictions are appropriate for you.
Best wishes with your surgery!