For Glamorgan
38 balls – CB Cooke v Middlesex at Merchant Taylors` School, 2023
46 balls – CA Ingram v Sussex at Arundel, 2017
47 balls – KS Carlson v Somerset at Sophia Gardens, 2024
50 balls – IJ Thomas v Somerset at Taunton, 2004
50 balls – CA Ingram v Essex at Chelmsford, 2017
56 balls – CA Ingram v Essex at Chelmsford, 2016
61 balls – J Allenby v Middlesex at Richmond, 2014
61 balls – JA Rudolph v Gloucestershire at Bristol, 2015
Against Glamorgan
42 balls – BF Smith for Worcestershire at Worcester, 2005
46 balls – DW Lawrence for Surrey at The Oval, 2025
47 balls – VS Solanki for Worcestershire at Worcester, 2009
48 balls – MJ Prior for Sussex at Hove, 2010