Google Spreadsheet imports remain active until you reset your spreadsheet token. To reset your spreadsheet token login to your account and go the the Settings page, at the bottom your can reset your token.
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Sentiment is determined on moving averages, when a short term moving average is above a long term moving average the trend is bullish, when the long term is above the short term the trend is bearish. Undecided when the values are close to each other.
The number of API requests are limited. A hard limit prevents you from making API requests above the request limit. A soft limit will let you continue to use the API and provide you with an opportunity to upgrade your subscription.