If you read the book you will find it takes weeks to arrange the contract since it must be done face to face and involves lawyers and paperwork, the purchasing and procurement of weapons likewise takes months. It is not something that is done quickly via the interwebs...
Agreed, but that's mainly because the operation is illegal (e.g. their procurement of weapons), as the merc status in Earth is not the one in Traveller. In a world like the one in Merc 2000 this will probably take a matter of hours or days at most...
Transport to the operation area takes weeks for some of the mercs and the equipment since it goes by tramp freighter.
That's the part I find similar to Traveller.
In the book they choose to use a tramp freighter for insertation, and they buy it, not hired passage, nor even chartered it, mostly for stealthy insertion reasons.