Samir meets a woman at a party. She gives Samir her telephone number so he can call her. Samir has about to write down the number before his short-term memory store is depleted.

20-30 seconds

Explanation:

Samir meets a woman at a party. She gives Samir her telephone number so he can call her. Samir has about 20-30 seconds to write down the number before his short-term memory store is depleted.  The short-term memory can hold about 7 bits of information for about 20-30 seconds before it is depleted or else enforced via repetition which can transfer the information to the long-term memory.

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