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The production of L hypernuclei was studied in proton reactions with Bi nuclei and the lifetime of the produced heavy hypernuclei was measured by the observation of delayed fission using the recoil shadow method. The measurements were performed at 1.9 GeV proton energy whereas the background was determined at 1.0 GeV. From the distribution of the w Ž. Ž .x fission fragments in the shadow region the lifetime t s 161 " 7 statist. " 14 system. ps was obtained and from a comparison of counting rates of prompt and delayed fission fragments the production cross section of hot L hypernuclei was Ž. determined to be 350 " 140 mb.