XtremIO Online Cluster Expansion would normally be done under a specific Professional Services line item for that specific service (normally PS-BAS-XTUPXB, but it will depend on the exact situations), not a block of hours.  It is possible that the entry you're referring to includes some other services that they have simply grouped into a single entry, but I would suggest going back to your sales team and confirming exactly what they have included.  As far as how long it will take, it depends on the exact situations, but generally it's a matter of a few hours.  The process is basically racking the new bricks, connecting them to the existing IB switch, and then running a few commands on the XMS - from there the process is basically auto-pilot as it looks after upgrading the new bricks to the correct firmware, bringing them online, and then migrating half of the data to the new bricks so that everything is perfectly balanced.  The data migration itself might take a few hours itself (depending on how full the array is, and how busy it is at the time), but there's no noticeable impact during that period (after all, you've got twice as many storage controllers now!!)
We are planning to expand our XtremIO from two to four x-bricks. A purchase and services quote includes a line item for a block of 40 hours of professional services for "Engineering for XIO brick expansion". As the original install was less than a day, and EMC boasted about ease of expandability, I question this 40 hours needed to install two additional x-bricks. Can someone verify or correct my thinking on this please? Also, am I correct in thinking this is not a customer installable unit?  Thank you, Bryan
Expected XtremIO Expansion Time