I simply use sqlplus
and give / as sysdba at the username prompt.

If the system is stricktly yours, and your system has the ability to be "put to sleep", set logon to be your system username/password, log on, work(all day) then, set system to sleep. After all the up front work is completed, you are home free. Sure, you will have to enter username/password to "awaken" your system, but only one time.

bada bing, your ready to be productive.