Re GTC vs 30 day rule. I've also learned the hard way to avoid GTC buy orders on stocks. Too much risk of catching a falling knife, which is particularly bad in AIM.
I like to check every 1-2 weeks. I place GTC sell order on stocks and ETFs and I do place GTC buy orders on ETFs.
I think it's safe with ETFs to place GTC buy orders as the main issue with these for AIM is low volatility, so if you just check once a month your ETFs you could miss a useful buy.
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