If you follow this guide, you can get more or less 200 mil xp an hour depending on various factors such as Crypt spawn, zombies spawn, team members, kill speed and etc.
Festering -> Decaying Crypt -> Field
No Bells, no CM, preferably no EF. Best with monk's cyclone implosion, Archon, HOTA/Rend
Finding the Crypt will be a piece of cake if all 4 players has a WW barb or TR monk. Each create their own game and look for the crypt in Field. Once found, invite all other members to join the game with their toons which need leveling, while he continue to explore the Crypt to reach Crypt level 2. Other members can now proceed to Festering and wear down at least 3 elites packs for quick kills later. Once reach level 2 and if he is using P100 barb or monk and wish to change Character, ask 1 or 2 team members to teleport to Crypt lvl 2 to save the portal.
Knowing the map layout is important too. Crypt only spawn at top right or bottom left of map.
After everything is set, all 4 players go to festering and finish off the elites. Players who have save the portal to Crypt 2 have to use the way point to get back to town and teleport to Crypt 2. Others will follow. There are 2 NV at Crypt 2 i.e. a chest and family event. Get the 5 NV, kill some zombies and proceed to Crypt Level 1, then Field.
Tip:WW barb should always move ahead of others to lure mother zombies spewing more little zombies. This will maximize density.
101,431k XP Gained in 35 mins including set up.
Paragon 47 - 32,743k
Paragon 48 - 68,688k ( 9 bars)
Congratulation to degamer who achieved Paragon 500 in this video.