Ann: Strong Gas Shows in Multiple Upper & Lower Angwa Reservoirs, page-709

"the time required to pump out mud filtrate to obtain 18 samples might be about 180 hours - tool might get stuck well before then."

LOL...nobody has ever taken a week to run an MDT......if I had a tool in the hole that long Id have the Company Man pounding on the wireline unit door reading me the riot act.

If it's taking 10 hours to get a clean sample on your first station you'd sit back and evaluate whether it's worth trying to sample other stations with similar pretest mobility readings. I've spent around 35 years running wireline formation test tools. Average run time for an MDT in sampling mode (12 MPSR/SPMC) was about 20 hours....longest run would have been close to 30 hours. Some of those runs were in some fairly low perm reservoir. The longest I've pumped on a station would be around 6-7 hours.