In general, I find that parvi's are the shortest lived...delanatii is good for 3-4 weeks, emersonii for only 2 weeks....can't speak much for the others. Brachy's last about 4-5 weeks...most multi's 3-6 weeks per bloom...the insigne types 6-8 weeks, and the barbata, anywhere between 6 and 12 weeks...hybrids last longer. Complex types can easily go over 2 months, and some of the Maudiaes just as long if not longer. 3 months is not unheard of...my longest lasting blooms may have reached 4 months. The longest lasting species bloom was an urbanianum that lasted nearly 4 months. The cooler the room, the longer the blooms. Take care, Eric