We have timedwait in Base (but this polls) or you could follow the following pattern:
cond = Condition()
Timer(x->notify(cond), max_time)
t = @async begin
# do stuff
notify(cond)
end
wait(cond)
t.state == :done ? fetch(t) : :timeout
see also: How to wait on a condition for tasks
Better yet to put it in a function! Then you can return a value or a timeout.