Palace of the Dead

[Sylvain]

it is a very fast way to level up actually. spamming 51-60, a run takes 20-25min and grant a fifth of your level past 50, (until a 8th-9th when you reach higher level) so you basically do level in a a few hours.
Assuming you'd spam them quickly and do everything to complete every run in an optimal time. You could probly do 50-60 in 2-3 days

[hakurou46]

For lower levels (esp. farming 1-10), it's easy enough and Pomanders of Strength are plentiful enough that you can eat one just to clear the dungeon a little faster. People still save them to shave seconds off the boss rather than minutes off the dungeon, for some reason. A full run takes just over 10 minutes at a medium-fast pace, and the strength and haste buffs last for seven minutes. It's honestly a waste to not use them.