Yes, For that there are two options. either you main user session
with cookies and set the cookie expiry time span to 24 hrs else, I
would recommend you to use sql server session state for this purpose
check this http://support.microsoft.com/kb/842044.
you can also add the following lines to increate session timeout
<sessionState
mode="InProc"
stateConnectionString="tcpip=127.0.0.1:42424"
sqlConnectionString="data source=127.0.0.1;Trusted_Connection=yes"
cookieless="false"
timeout="720"
/>
<!-- assuming 12 hrs session timeout --> cheers
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