According to the source, Vitalik Buterin said Stage 1 optimistic rollups could reduce withdrawal times to 1–2 days while Stage 2 would retain a 7-day window for maximum security, source: the source post referencing Vitalik Buterin’s public comments. Optimistic rollups today typically enforce a roughly 7-day dispute period for withdrawals, which affects exit latency and capital lock-up, source: Optimism documentation and Arbitrum documentation. The Stage 1 and Stage 2 taxonomy and their security assumptions are defined in Buterin’s rollup stages framework, source: Vitalik Buterin blog. For trading, monitor governance and implementation updates on major optimistic L2s such as Optimism (OP) and Arbitrum (ARB) because any change to exit windows directly shortens the time until bridged funds can be released to L1 or exchanges, source: Optimism documentation, Arbitrum documentation, and ethereum.org guidance on rollup withdrawals. Also track ETH L2 usage and sequencer revenue dashboards for activity shifts around any exit-time changes, source: ethereum.org rollups overview and L2 ecosystem analytics such as L2Beat.