Gifts
The gift giving ceremony was just one of many. Some might consider the process to be unnecessarily complicated and tedious, but such an assumption was lacking in perspective. Excluding special situations, such as the ongoing war during this wedding, most of the time the nobility tried to make everything as long and detailed as possible. Even if most members of nobility never reached the immortal realm, it was completely normal for them to reach the Nascent realm.
The average Nascent realm cultivator could live up to 500 years, give or take a few. With such long lives to look forward to, most of their activities were slow paced and would take a long time. This phenomenon became more obvious the greater the cultivation level a person had.