You can give 20 minutes to do light loosening exercises / suksham vyayam / yogasanas every day, alternating with two sets of combinations of warmup, asanas and pranayama.
As per your convenience, you can do the following sets:
1st set:
warm up - 5 minutes
yogasanas - 8-10 minutes
pranayama - 3 minutes
relaxation - 2 minute (Quick relaxation or instant relaxation technique)
Under warm up, take light loosening exercises or sukshama vyayvama as designed by Swami Dhirender Brahmachaari.
Under yogasanas, in the first set, you can do tadasana, katichakrasana, uttanapadasana and ardha-chakrasana, vajarasana. In the second set, you can do ardhmatseyndrasana or vakrasana, gomukhasana, bhujangasana, shalabhasana, dhanurasana.
Under pranayama, on one day, do naadhi shodhan pranayama and on other day, you can do kapalbhati or bhastrika as per time availability but within your stamina and capacity.
I hope that this would serve your purpose.