I am a $1B bank, 4 branches, about 300 CTRs per YEAR. Therefore I utilize a Teller who handles all of it for me. (She's brilliant). Takes her maybe a half hour to 2 hours a day depending on the day.
At a prior bank, I had about 300 CTRs per MONTH and we had a full time FTE when we were paper filing, but it quickly lowered to half an FTE (if that) once we filed electronically through software.
If you're still on a paper trail - I could see half a FTE being difficult, but since everyone's going electronic soon, you may be on the right track.
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My opinions are my own, and not that of my employer.