You have two high level characters. Grab the bounties after your nightfall and you will have it fully upgraded by the end of the day. (24 bounties across both characters) We will say for posterity sake that all 24 of those bounties are only worth 2500 xp (even though most of them are double that) and two daily stories at 7500 XP a pop. That gives you 60,000 to 120,000XP for the bounties, another 15,000 for the daily stories and anywhere from 3,000 to 6,000 for the daily patrol missions. Totaling (not including the XP for the mob kills from the stories or the bounties/patrols or XP from killing guardians in the crucible or XP gained in the crucible). 78,000 to 141,000 XP before adding in your 20% more for the nightfall. After nightfall that would make it 86,800 to 155,100 XP. That is for one day. You won't even notice the upgrade process.