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Several high energy physics and neutrino physics experiments worldwiderequire large-size RPCs to cover wide acceptances. The muon tracking systems inthe Iron calorimeter (ICAL) in the INO experiment, India and the near detectorin DUNE at Fermilab are two such examples. A (240 cm $\times$ 120 cm $\times$0.2 cm) bakelite RPC has been built and tested at Variable Energy CyclotronCentre, Kolkata, using indigenous materials procured from the local market. Noadditional lubricant, like oil has been used on the electrode surfaces forsmoothening. The chamber is in operation for $>$ 365 days. We have tested thechamber for its long term operation. The leakage current, bulk resistivity,efficiency, noise rate and time resolution of the chamber have been found to bequite stable during the testing peroid. It showed an efficiency $>$ 95$\%$ withan average time resolution of $\sim$0.83 ns at the point of measurement at 9000V throughout the testing period. Details of the long term performance of thechamber have been discussed.

Long Term Performance Studies of Large Oil-Free Bakelite Resistive Plate Chamber