The token trades around the clock. The share it tracks does not. This page will show both clocks live: whether the US market is open, and whether the tokenization window is shut.
Tokenized stocks trade around the clock. The actual share does not. From Saturday 02:00 CET until Monday morning the minting window is shut, the arbitrage against the real stock cannot be closed, and the price of your collateral drifts wherever it likes.