As said by someone else earlier, your catch up point calculations are wrong though.
Time taken to upgrade = 5 days = 108 hours
Level 11 collector resource gathering rate = 3000/hr
Potential Resources lost = 3000 x 108 ...............................(1)
Level 12 collector resource gathering rate = 3500/hr
Difference = 3500 - 3000 = 500 resources extra per hour ...................(2)
Dividing (1) by (2)
3000 x 108
----------- = 6 x 108 hrs (catch up point in hours)
500
Dividing this by 24 (to get catch up point in days)
6 x 108
------- = 6 x 5 = 30 days - which is the catch up point.
24





