As an elder, I used to do it all... TMS conductor, BS conductor, field service, studies, shepherding calls, phone calls, dealing with emergencies the members of the congregation were having.
I barely had any free time for anything other than Dub stuff.
And, I still felt inadequate. My stomach was always in knots. I used take off from work early on Tuesdays so I could finish preparing the material for the TMS that I didn't finish preparing in the 4 to 6 hours I spent on it on Sunday.
I actually had it good because I didn't have children to look after. My heart used to go out to the poor Dubs who did it all with kids--it ran them ragged. And, then if they missed a meeting they were looked down on.
OMG, I didn't realize how bad it was until I was out.