Yes, that 15 years is long term. Big respect to you for your amazing patience. Investing is tough, especially if you're speculating on new technology and whether it will become "the" necessary technology.
Like you, I owned LWLG years ago, (different ticker), and lost some money exiting as its price retracted. The tech wasn't ready then. I've monitored LWLG for years without a position. The tech was always intriguing but it didn't look ready to really move. It is now at the ready to move stage. I bought my first shares of LWLG in years on 11/18/2020 because of the PR's and board chatter. You're 15 year wait is about to be rewarded "bigly" IMO.
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