In the UK same as what Kim said but you can also say
I have to stick to a/my schedule
I have a tight schedule = no spare time between appointments
you can replace have with must
I must keep/stick to my schedule/
October 30, 2019
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I have a schedule to keep.
I have to keep to a schedule.
I have to stay on schedule.
I have to keep to my schedule.
October 30, 2019
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