You're within the range of normal.
The rate of air loss depends on pressure, and the ratio of surface to volume of the tires. Higher pressure bleeds faster, as do skinny tires vs. fat ones. But all tires bleed the same way balloons lose air over time. It isn't a leak, but a matter of porosity to the small gas molecules. Tubes also vary, with some doing better than others even within the same brands, due to variations in wall thickness.
My 105psi 25mm road bike generally loses about 10% of tire pressure per day. OTOH my commuter using 1.9" tires inflated to 60psi loses about 15-20% per week.
I top off the road bike every morning before riding, whereas the commuter is a Sunday chore along with putting out the trash.
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