Post updated with skills which are booked.
Example of calculation, taking LWT as example, 4839 skills at 1100%, with ESI provided by the buyer:
Estimated ESI TT needed to chip all LWT out = 145.36 according to entropiatools.com
= 145.36 peds X (1100% - 750%)
= 145.36 peds X 350%
= 508.76...