Cf: As long as the pot boils, friendship lasts (Am., Br.). The bread eaten, the company dispersed (Br.). The dinner over, away go the guests (Am.). Feasting makes no friendship (Br.). Having finished the meal, the company leaves (Am.). In time of prosperity, friends will be plenty; in time of adversity, not one amongst twenty (Br.). In time of prosperity, friends will be plenty; in time of adversity, no one in twenty (Am.). When fortune frowns, friends are few (Am.)
Русско-английский словарь пословиц и поговорок. Академик.ру. 2013.