Say that you are unable to pray with a minyan, and it is a day on which musaf is said. You plan on praying everything up to and including shaḥarit in one go, and then pray musaf later (since musaf need not be said at the same time as shaḥarit). What do you do about everything that comes after shaḥarit besides the musaf prayer itself?
I see two main possibilities:
- You should not deviate from the usual order of the prayer service. You should stop at some point (where?) after shaḥarit, and continue from that point (without repeating anything) when about to pray musaf. Motivation for this choice: this is how the service "normally goes".
- You should finish the prayer service as you would normally do, omitting musaf, and pray musaf (and only musaf) later. Motivation for this choice: most of the post-shaḥarit elements are also said on a day without musaf, so why should we omit them now?
Or perhaps some middle ground, where you still finish the service (whatever that means), but omit more than just musaf (say, ein keloheinu on shabbat, or hosha'not on sukkot), or perhaps where you repeat certain sections when praying musaf (eg. say ashrei again).
Does the answer change depending on how long the gap is between shaḥarit and musaf? Does the answer change depending on what the day is (shabbat, yom tov, rosh ḥodesh, ḥol hammo'ed)?