Rogue Miner license lasts lifetime and I have no plans to shut the service down now nor within next months. In truth I have no plans to shut it down at all. You can buy with confidence.
If you're interested in mining specific currencies and you don't know how to check if they can be mined with Rogue Miner, you can contact me or post the currency that you'd like to mine.
Rogue Miner web builder can be used 24/7 without any time constraint. You can create your builds whenever they're needed, just visit the proper web page.