I started my reading arc with a similar tactic. I set the reading goal in Apple Books to 15 minutes and just went for it (you get a nice streak counter, etc.).
It works to give yourself a nice manageable goal, rather than strive for something harder (like an hour every day). Currently at a 174 day streak 
I don’t even use Apple Books anymore (TTU makes reading harder materials easier), but still try to keep that streak going in the App; although it’s only set to 1 minute now 
