Not fully understanding payments

Hi All, so I’m trying to find my way around the app and get used to the ui I’ve had a couple issues but I think it’s more my understanding rather then the app itself , however , from my understanding any spaxx I have in my account is basically my cash in account , however I made a purchase early last week expecting to use my spaxx to cover the purchase amount , however it has been almost a week and while I do have the extra stocks I wanted to purchase no money came out of my spaxx or my actual bank account , does it usually take this long or is something else going on ? Thanks for the input I’ve had multiple posts now for the last few weeks now with trying to get used to how everything works ,