Is it possible to keep charging a fully charged 20,000 mA power bank with a 9v 3W solar panel for a week straight..?

Is it possible to keep charging a fully charged 20,000 mA power bank with a 9v 3W solar panel for a week straight..?

i have a 5 volt, 20,000 mA capacity power bank: https://uae.souq.com/ae-en/veger-20000mah-safe-efficient-fashion-3-usb-output-power-bank-for-smart-phones-v100-black-color-11996007/i/

a 9V, 3 Watts, 0.33 A solar panel: https://www.enfsolar.com/pv/panel-datasheet/Polycrystalline/25971

i'm using the battery to power three arduino unos. They power three things which all add up to 4.15 Watts approx (not including the arduinos themselves)

So my question is, if i keep charging the powerbank with the solar panel, while the power bank is powering the 3 arduinos with 4.15 W power, the solar panel charging will help the power bank's battery stay charged for longer, but how long until it finishes exactly..? a few days or maybe a week? can someone please tell me how to calculate it? i'll be forever grateful

submitted by /u/music2169
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