With another round of 10x descends coming up, it is worth planning ahead on which dungeons to repeatedly farm. You should have 100% success rate in clearing the descend as any failed run will set you back and make even the most efficient dungeon unideal. Everyone has different goals in terms of number of plus eggs they wish to farm along with the number of stones used to refill stamina and the chart prepared below should help you plan out your next event. Please read my Plus Egg Fusing Guide for more information on how to quickly form +297s with minimal gold usage and thinking.
The chart assumes the highest level of difficulty and on regular 1x drop rates. Number of pluses increase with enhanced drop rates. This also applies to coin dungeons and these become the best to play with 1.5x or 2x drop rate as you are more likely to hit the higher number of pluses per run.
**Do note that the 30 stamina of Tengu from coin dungeons on 1.5x drop rates is amazingly efficient and has a follow up post HERE to better discuss it.**