It is a commonly known that both Foreign Affairs and Domestic Affairs Chancellor tasks are close to useless. +6-10 relations is barely noticeable and will certainly almost never make an impact on your gameplay. Even more so since you will have to wait 2 years to gain the full boost. This is the case because the formula used for both Chancellor tasks maximum boost is skill / 2.

With this mod Foreign Affairs will give 3x more relations with independent rulers
(15 diplomacy = +22.5 relations; 20 diplomacy = +30 relations)

And Domestic Affairs will give 3.5x the regular maximum amount with direct vassals
(15 diplomacy = +26.25 relations; 20 diplomacy = +35 relations)

You will still need to wait 2 years to gain maximum relations boost. Paradox set this restriction so players wouldn't use these tasks for 1 second before finalizing an important alliance and then switching to a different focus so I didn't mod out the incentive to stay on these Chancellor tasks for an extended period of time.

However the monthly relations gain is dependent on the maximum relations boost. That means monthly you will still be gaining 3x and 3.5x more relations than in vanilla. Say, without this mod with a Chancellor skill of 15 you would have gained +0.3125 relations monthly. With this mod you will gain +0,9375 for FA and 1,0938 for DA