starting, stopping and waitFor in a timer

I am not exactly sure what you want - but I think this is close.

1. Creating a timer that blocks the MATLAB command line for a certain time.

%% Create a timer
t = timer('Name','maxtimeBetweenEvents','StartDelay',30,'TimerFcn',@(x,y)disp('Hello World!'),'Tag','Waiting');

%% Start a timer

start(t)

%% Start your waiting 

wait(t)
disp('The wait is over!')

2. To restart the timer.

start(t)
wait(t)
disp('The wait is over!')