src/main/java/io/reactivex/Maybe.java
@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.CUSTOM)
    public final Maybe<T> timeout(long timeout, TimeUnit timeUnit, Scheduler scheduler) {
        return timeout(timer(timeout, timeUnit, scheduler));
    }
@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.CUSTOM)
    public final Maybe<T> timeout(long timeout, TimeUnit timeUnit, Scheduler scheduler) {
        return timeout(timer(timeout, timeUnit, scheduler));
    }
Returns a Maybe that mirrors the source Maybe but applies a timeout policy for each emitted
item, where this policy is governed on a specified Scheduler. If the next item isn't emitted within the
specified timeout duration starting from its predecessor, the resulting Maybe terminates and
notifies MaybeObservers of a {@code TimeoutException}.
<p>
<img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timeout.1s.png" alt="">
<dl>
<dt><b>Scheduler:</b></dt>
<dd>You specify which {@link Scheduler} this operator will use.</dd>
</dl>

@param timeout
maximum duration between items before a timeout occurs
@param timeUnit
the unit of time that applies to the {@code timeout} argument
@param scheduler
the Scheduler to run the timeout timers on
@return the new Maybe instance
@see <a href="http://reactivex.io/documentation/operators/timeout.html">ReactiveX operators documentation: Timeout</a>