There are two concerns about your upgrade.
Direct upgrade to 11.2.0 is not support from version 18.104.22.168, at least you should be on version 22.214.171.124.
126.96.36.199 is not supported on solris8, at least you should be on OS version - Solaris 10.
Please refer MOS tech notes:
Upgrading to 9i with Standby Database in Place (Doc ID 165296.1)
Upgrading Oracle Database with a Logical Standby Database In Place (Doc ID 437276.1)
Complete Checklist for Manual Upgrades to 11gR2 (Doc ID 837570.1)
X A H E E R
The upgrade process itself will take about 4 hours. Pl review this presentation View content for various options that are available to minimize downtime. These options will likely incur additional cost