What is your practice routine when you only have half an hour to practice?
To your original question,I usually practice scales, chords, and progressions on the piano in my weakest keys. Also, I try to learn at least one new concept a week. For example last week I learned some riffs and runs from a smooth jazz pianist by the name of Marcus Johnson.
on those days when I pracice for a half hour it is usually because I am not motivated that day.
it is rare that I only have a short amount of time to practice
but here is a short practice routine I do on some sunday mornings before leaving
I dont do this any more but I used to live by this routine.
hanon as much as you can whatever you are up to
even if you dont do hanon much any more if you only have a short amount of time then hanon is the way to go
I would just fill up the whole half hour with hanon
it wakes up your fingers
now if you dont do hanon and arent interested in hanon
then I would say practicing shouts in every key for a half hour
would be a good thing to do
Right now I have a routine that takes about 20 minutes
I play 2-5-1-6 progression in two positions for each chord
while soloing over the left hand chords with my right hand
so thats two II chords
two IV chords
two I chords
and two
VI chords
this way when I am in service and have to reach for a chord in a new key I can grab it with out too much fuss.
other short practice things
just simply sight reading both hands looping each measure
while singing and saying the letter names of the notes
a grueling tortuous type of practicing but it does wonders for your sight reading
another sunday morning routine you may try
is
to turn on one of the internet gospel stations or cable gospel radio
and play along with the tracks
may give you a nice talk music or seque piece for service.
I just gave you
a technique
a transposition
a reading
and an ear routine
something for everyone