Based on "NOrth American Grain Charterparty 1973". It is a practical despatch money calculation I have to do for university.

On one hand I have this data: " running days". On the other hand I have this incoterm: "SHEX"

First question: is it posible to comply with the two conditions?

After a laytime statement the obtained result is "despatch money"

The teacher stablished two differences : first case (the exercise case) "Despatch money for all time saved". Second case (other general case) "despatch money for all laytime saved".

I think I understand the second case , the laytime available is a total time of 02(days)00 (hours) 37(minutes) the ship used on loading a total time of 01 (days) 05 (hours) 00(minutes), so the despatch money for all laytime saved is 00(days) 19 (hours) 37 (minutes).

I will give a little explanation of the exercise: time to count from Twesday 18 0800 laytime to load 02 (days) 00(hours) 37( minutes) time expired thursday 200837. The ship started to work on saturday 15th and finish monday 17th 0830 (total time used on loading operations 01 (days) 05(hours) (00 minutes).

For me, the problem of understanding comes now: calculation of despatch money for all time saved, thursday 20 0837 - 010500= 190337 time expired will be on wenesday 19 in stead of thursday 20, so in this case despatch money calculation would be 170830-190337=011907(despatch money for all time saved)

At the beginnig I thought this way: the ship started to work before laytime start, she works 010500 so I can suppose that the total laytime I have is 020037-010500=001937, so to know the expired day 180800-001937 =but obviously this is wrong so I need a good explanation. Can anyone help me?

Thank you in advance. ■