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half life for laterite?

When I originally set up my tank I added laterite to the gravel mix. It has been several years since it was originally added, and while it is still quite visible in the mix, I was wondering if there was a period after which the trace elements would have effectively leached out (e.g. no longer provide iron etc.).

Since I don't have a test kit for trace elements, I thought I'd ask if there was a rule of thumb.

I've been supplementing with 2 droppers of the Flourish liquid fertilizer about once a week, but I added DIY CO2 last night, so I expect that the plants needs will be going up... wanted to know the contribution from the laterite (if any, so I can take it into account when adding supplementals).

I'm not sure it really matters whether the laterite is still assisting, I'm mostly curious.