I agree with @Mort. The party with the ranger has more time to deal with the cult, and that is a good thing. The feature is benefiting the party, which is what those features are intended to do.
It's only a problem for the DM who insists that the players need to interrupt the ritual at the last possible second, but also insists on using a clock. In which case the only problem is the incompatibility of those two agendas. It can still be done, but you can't be hamfisted about it. For example, you could have the ritual nearing completion whenever the PCs bust in, but the clock determines some other factors, like how many demons the enemy has been able to summon.
Exactly. @Chaosmancer presents a ticking clock as binary (either the PCs get there just in time or the clock is a failure), when it should be anything but.