Simple math and i know not pure statistical analysis.
If Logray is 1/6 chance to drop, over a week that's 28 chances, which is a bit over 4.5 drops per week (if 1/6 holds). So, over 2 weeks that'd be 9 drops = 45 shards. (22.5 per week) which nets you 330 shards in roughly 15 weeks.
94 over 7 weeks is under that at 13.5 per week.Taking you from 15 weeks to between 25-30. Providing the numbers don't change. I can't say the numbers won't change, but both Dengar and Zam were fairly consistent throughout.