calculating multiple stop/start timers within a cell

hi guys,

in the attached sample file, i'm trying to figure out the "time to finish" for each item number. i have a start timestamp and an end timestamp. the result is a number of days to "finish".

easy enough until i factor in that each item number can be suspended. i want to remove that time the item was suspended from my "time to finish" result.

i have one column for the suspend start timestamp, and another column for the suspend stop timestamp. each is enclosed in a set of {}. it gets difficult because each cell here can have multiple timestamps within the {}, each separated by a comma (as seen in the sample file). so for an item suspended 3 separate time, a cell in column E would have 3 suspend start timestamps, and the corresponding suspend stop timestamps are in the next cell in column F.

is there an easy way to do calculate the "time in suspend" in column G so I can subtract that from the time to finish in column D?