^ I'm not exactly sure what you're asking here OhOh... that topside and FPSO are nothing to do with us. We just passed a small shipyard south of Bergen.
But, if you're asking about the ship I'm working on... we have a standard spread and any extras will be added as and when required. If the equipment is company owned then it may stay onboard for some time until required but if it's rented from a third party then you have to way up rental costs compared to the costs of an unscheduled port call to mobilise everything.
For example, that dredging machine we took on costs a small fortune (all passed on with a surcharge, of course). It's not only the cost of the equipment hire... the dredger comes with a crew of 6 and then we need 4 x riggers (2 to cover each shift), 2 x deck foremen and 2 x shift supervisors, so there's an additional 14 personnel who all want paying. None of these guys are cheap in Norway so you can see how costs escalate dramatically. That underwater dredging machine will have cost many thousands of pounds per day for the client, on top of the usual ship/spread hire rate.