Alkaizer went from level 76 to level 81 in about 24 hours (period measured by "last logout timestamp" attribute).
Amount of kills on his account:

- Level 76, Elite Kills: 68556, Lifetime Kills: 1216106

- Level 81, Elite Kills: 71787, Lifetime Kills: 1294228

So it was 78122 normal kills and 3231 elite kills in 1 day.

Or 3255 normal kills per hour and 134 elite kills per 1 hour.