How long has it taken for your driftwood to sink?

Usually a couple of weeks, but I have heard of it taking a few months in extreme cases.

I myself have not used driftwood for my tanks in the past but I do have friends that have used driftwood in their tanks. They bought the driftwood from the store that was not in water, and it varied on how long it would float for before it did sink like it should do. I remember one friend that purchased driftwood that had not been kept in water and he told me it only took a couple of weeks for it to sink but then another friend was waiting just over a month for their driftwood to sink that they purchased. It really does seem to be a variation for each person.

I went for a shortcut and I glued it to the bottom of my tank. So it stayed there till it kind of would have sunk over time. Make sure to use a water resistant glue.

Driftwood has pores all over them. Generally, the pores are filled with air that usually keeps them afloat. So, by boiling method, we can remove the air pores with water. So eventually your driftwood will sink at a maximum of 7 days.