Bl Morning Glory bloom time

[Polypodiaceae]

My Morning Glory had a nice spike with 3 large radiant pink flowers. However, they only stuck around for about 14 days, not long enough to fade to white w/ purple speckles. This is the first time it's bloomed for me, though the plant shows signs of having bloomed previously. How long do the blooms usually last for you?

[Moody2]

2 weeks is what I have seen the last couple of times it bloomed