32v 1m wait
From Computer History Wiki
WAIT(1) UNIX Programmer's Manual WAIT(1)
wait - await completion of process
Wait until all processes started with & have completed, and report on abnormal terminations.
Because the _w_a_i_t(2) system call must be executed in the parent process, the Shell itself executes _w_a_i_t, without creating a new process.
Not all the processes of a 3- or more-stage pipeline are children of the Shell, and thus can't be waited for.