I guess this question can't be answered to the exact numbers as there is no information on how each one of these occurrences multiplies through another but we can still calculate a basic solution.
Rapid respawn increases the respawn rate by 10x
Specific area increases the respawn rate by 2x
Similarly, boosted creature would double the respawn rate by 2x
At the very least the respawn rate would be 14x the usual.
If we assumed that the respawn rates multiply by each other you could theoretically get a 40x respawn rate.