Senses
多会儿/ 多會兒 when
(colloquial) at what time (interrogative used to ask a question)
多会儿/ 多會兒 [short duration]
Used with 没 to indicate a very short period of time or that not much time has passed
多会儿/ 多會兒 whenever
(colloquial) at any time (indefinite pronoun often used in conditional statements)