Siman 620
Presented here for study, not as a practical ruling. The Shulchan Aruch rules by Sephardi custom, the Rema's glosses by Ashkenazi custom, and the Kitzur follows Ashkenazi custom. For a practical question, ask your rabbi.
א טוֹב לְקַצֵּר בְּפִיּוּטִים וּבִסְלִיחוֹת שַׁחֲרִית, כְּדֵי לְמַהֵר בְּעִנְיָן שֶׁיִּתְפַּלֵּל מוּסָף קֹדֶם שֶׁבַע שָׁעוֹת.
1 The beautiful custom to shorten the Morning Prayers and in it is 1 paragraph It is good to shorten the liturgical hymns and penitential prayers of the Morning in order to hurry in the matter to pray Musaf before the 7th hour (of the day).