User blog comment:B214/Volume 23 discussion blog/@comment-31137559-20170326233819/@comment-1359322-20170409161551

Let's see. ExE duties, Oppai Dragon shows, Rias' Rating Games, Ise marrying more wives, helping Rias with her duties as head of the Gremory, fulfilling his promise with Sirzechs to help raise the next generation of Devils etc.

Sure doesn't seem like he has 5 to 10 years like you think, especially since Ise still can't join an official Rating Game for another 3 to 4 years. Don't forget Rias is still ineligible for an official Rating Game, Azazel Cup is an exception. And these are the duties that filled his schedule full for 200 years. It wouldn't even be surprising if Ise only had 1/2 years in RG before retiring.