Inquiry Submission By BeachBaller

OK guys …. I’m trying to fully understand this process and not waste time or money on surprises!

I am a US guy flying into Phnom Penh for 4 days, then leaving for 2 days for a quick trip to Bangkok, then back to Phnom Penh for 4 more days to conclude my trip. If I understand correctly— even though it is a 30 day Visa, it is a single use one, So, I will need a new one on my return from BKK?

If so, can I purchase 2 online and just activate 1 at a time?

Thanks for your help