When less Āsana time than you would like,
better to reduce the number of Āsana,
or the number of repetitions,
or the length of the stays,
rather than, reducing the length of the breath.
Or….. even considering lengthening the breath,
thus even fewer Āsana, all with a longer breath than usual.
Here the Bhāvana could be to observe the effect
of a more spacious than usual Āsana breathing
on a more cramped than usual daily mindset.