Questions about totem of corruption

[Pomost1]

so i need like a ton of corruption totems and few questions about them:
1. can you lengthen time of totem of corruption in any way?
2. Sulophur i can buy from bz, corrupted frags can be generated by minions, what about magma chunks? can you automate it as well or i need to spend hours upon hours to grind them?
3. if i need to grind magma chunks then whats the best way of grinding them? just like a hype in burning desert or is there some sort of strat?

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