This really depends on you. There are people who just grab a finished template, change the necessary details and names, and feel entitled to post them to the guests. Others spend hours or even days perfecting the site so it would match the style of the ceremony perfectly. The other factor is the wedding site building tool. Some of them have samples where the placement of the lines and photos are fixed, while a few providers allow full control over the design, so you can completely rearrange the place of every detail. The amount of available design is another time-waster, in a good kind of sense. Nevertheless, we highly advise to spend some time on the invitations and the site so it would remain an enchanting memento of your Big Day.