There is no lock-in and no penalty — you can withdraw any time.
But it is not instant. Because ESA holds an underlying investment rather than cash, the holding has to be sold and settled before money reaches your bank. Expect a few business days, in line with other Wahed withdrawals.
This matters for one specific use case: if ESA is your emergency fund, it is not same-day money. For a genuine emergency where you need cash within hours, keep a small buffer in an actual bank account and use ESA for the layer behind it.
Business days exclude weekends and public holidays.