How many runs can a batsmen score on one bowl in such tricky situation in a test cricket ? What do rules say?

A powerful batsman hit the red coloured ball very high in the air above the field only in a hilly terrain but there were some clouds in the air space above that & at that moment a matching red colour hot air balloon too coincidentally pes above that. The ball goes inside that for no comeback. The fielders & umpires could not see where the ball went & waited for that to fall but that didn't come. All are confused but both batsmen are running to score as many runs as possible. Is there any limit on such scoring runs? Even TV cameras couldn't ure that the ball is gone inside the balloon which went far away.