In general, Ministerial Servants and Elders are "required" to keep up with the national average, as published in the KM. Another way to state this is "10 hours is the magic number".
While at Bethel, I struggled to get even 6 to 8 hours each month, in the field ministry. One Circuit Overseer threatened to remove me as a Ministerial Servant if I did not increase my hours. (This threat was done in public, during the meeting with the Elders and Ministerial Servants, during his visit.) Needless to say, the 44 hours of Special Full-Time Service I performed at Bethel was not "enough" for the Circuit Overseer. A balanced elder (a Bethelite) spoke to me after that meeting and said the following: "If this guy [Circuit Overseer] can't show up every six months and be encouraging, forget him! We'll see him in six months!"
You can never do enough. It's a numbers game and it has nothing to do with your heart condition or your love for God. The Circuit Overseer needs his report to look good. Appearances mean everything. If you're getting 100 hour per month, but the friends don't see you "taking the lead" in the ministry, it's not enough.
From what I've read, this is very typical of most cults. You must EARN your salvation and have the works to prove you're making the grade.
Romans 14:23b tells us the following: "Everything that does not proceed out of faith is sin."
If you're engaging in the ministry to simply "count time" or "get your hours in", does it really proceed from faith?