The experiment was carried out at Jute Research Sub-station, Kalapara, Patuakhali during the jute growing season to determine optimum field duration on yield and quality of different C. Capsularis variety and salt tolerant Variety BJRI Deshi Pat-10. The experiment was laid out in RCBD design with three replications.  One C. Capsularis variety BJRI Deshi Pat -8 and salt tolerant variety BJRI Deshi Pat-10 were used as study material. Crops were sown on first week of April. The crops were harvested at different harvesting age (90 days, 100 days, 110 days and 120 days) regarded as the treatment. Crops were attained normal cultural practices. Result revealed that salt tolerant variety BJRI Deshi Pat-10 gave the highest fibre yield at 110 days harvesting age.