Stoic and Spotify using a total of 30+ hours of background. Apps are updated by pulling data from servers and servers pushing data to your iPhone. Spotify and Stoic are pushing data to your iPhone and your Home & Lock Screen is being utilized. Many times when notifications come in the Screen will illuminate so you can read the notifications.
Do you use any Focus modes to restrict the background usage of those apps? If not you might want to.
Stoic also has an AI component I notice. AI can consume a lot of battery and that may be a lot of the background activity.
What does the last 24 hours look like for the apps? A lot of the Home and Lock Screen could be at the start of the 10 days and have settled down the last few days.