We don't know. It's iTunes performance after the official release will probably dictate when.
If the song starts to take off on iTunes after the official radio adds, then it probably won't be until a month or so. However, it it struggles on iTunes, then we might get it pretty soon.
I love Katy for not wanting to slow down her era and her plan because something goes wrong.
With this I'm predicting another summer hit before August and Legendary Lovers for fall.
Ugh, I'm still so PRESSED
At least wait until next week...ideally a month from now though, it's already steadily climbing iTunes
You are going to ruin the chart life of this BOP...and I will NAWT stand for that
what'll probably happen is Katy's going to ruin all these peoples brithdays and then the character will "leave" for some reason and the real/sexy katy will jump out of the cake and surprise everyone. She wouldn't just ruin people's birthdays and not tell them it's actually her
I've been having my own little meltdown all night. Not because of the video, but because it seems way too soon. But I've decided to just be excited and hope for the best. Two massive WW hits this era is more than good enough
I don't care what the content of the video is, it's Katy so I know it's going to be high quality and entertaining. She hasn't had an unwatchable music video.
I'm just mad that they're wasting the potential for Birthday to be a huge song. At least let it pick up on radio, if not iTunes as well, before giving it a streaming boost. It was like, what, two weeks between the lyric video and official video? Too soon
I've been having my own little meltdown all night. Not because of the video, but because it seems way too soon. But I've decided to just be excited and hope for the best. Two massive WW hits this era is more than good enough
This is a mess. There's no need for the video when dark horse is still the #1 most viewed video worldwide by a big margin. This is at a Gaga-saturation of image level.
Don't leave us 
Princess Mandee >>> Kathy Beth > Katy Patra
