src/main/java/io/reactivex/Maybe.java
@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.CUSTOM)
    public final Maybe<T> delaySubscription(long delay, TimeUnit unit, Scheduler scheduler) {
        return delaySubscription(Flowable.timer(delay, unit, scheduler));
    }
@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.CUSTOM)
    public final Maybe<T> delaySubscription(long delay, TimeUnit unit, Scheduler scheduler) {
        return delaySubscription(Flowable.timer(delay, unit, scheduler));
    }
Returns a Maybe that delays the subscription to the source Maybe by a given amount of time,
both waiting and subscribing on a given Scheduler.
<p>
<img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/delaySubscription.s.png" alt="">
<dl>
<dt><b>Scheduler:</b></dt>
<dd>You specify which {@link Scheduler} this operator will use.</dd>
</dl>

@param delay
the time to delay the subscription
@param unit
the time unit of {@code delay}
@param scheduler
the Scheduler on which the waiting and subscription will happen
@return a Maybe that delays the subscription to the source Maybe by a given
amount, waiting and subscribing on the given Scheduler
@see <a href="http://reactivex.io/documentation/operators/delay.html">ReactiveX operators documentation: Delay</a>