Yes, you can use multiple Conjure candles at once. It is recommended depending on the situation. For example; if you want to bring a lover to you but need to make sure they admire you when they do, then those two combinations (above) will work perfectly together. It’s a complete system that you put together. You know your situation better than anyone and what it needs. Using multiple Conjure candles together to implement your results is better.
• Absolutely, and it's recommended that you do. Burn each session for 6 hours and snuff it to be reused again.