RxJS Observable reset timeout - timeout

Question

Is it possible to reset/increase the timeout of an Observable after another timeout has already been set? In the following example the timeout of 5 should be overriden with a timeout of 9999, but this does not work:
var source = Rx.Observable
.return(42)
.delay(1000)
.timeout(5)
.timeout(9999); // this statement should override the previous set timeout of 5 MS, but actually it does not
var subscription = source.subscribe(
function (x) {
console.log('Next: ' + x);
},
function (err) {
console.log('Error: ' + err);
},
function () {
console.log('Completed');
});
Are there any possibilities to override the already set timeout?

Answer 1

Short answer: As far as I know, there is no "legit" solution to this.
Hacky answer: You could connect to the source of the timeout-ed stream and set your own timeout, see the example below how this could be done.
However, I would not advise you to do that in any seriouse project - I'm sure there should be another solution to your problem.
var base = Rx.Observable
.return(42)
.delay(1000)
.timeout(1);
var patched = base.source.timeout(2000);
var subscription = patched.subscribe(
function (x) {
console.log('Patched Next: ' + x);
},
function (err) {
console.log('Patched Error: ' + err);
},
function () {
console.log('Patched Completed');
});
var subscription = base.subscribe(
function (x) {
console.log('Base Next: ' + x);
},
function (err) {
console.log('Base Error: ' + err);
},
function () {
console.log('Base Completed');
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/4.1.0/rx.all.js"></script>

Answer 2

What about if you use a subject to represent your timeout value?
timeoutSubject = new Rx.ReplaySubject(1);
timeoutSubject
.asObservable()
.switchMap((v) => source.timeout(v))
.subscribe((r) => console.log(r));
timeoutSubject.next(5);
timeoutSubject.next(9999);
switchMap should take handle of the unsubscribing/resubscribing for each one of the timeout values.