Do you mean by “Sigil Magick” Invocation? Was it this video on the invocation of Viné?
You’re not wrong in saying sigil magick though, just clarifying. As far as repetition, yes while invoking you do repeat the spirit’s name etc. But for evocation, only repeat the operation if something went wrong or got blocked. However you can also repeat the spirit’s name in that method as well. No harm done, it’s a link to them.
Now there are rituals that many of us do as a routine in our daily practice and those are done repetitiously. But if you did a spell or petition, give it some time before repeating the whole ritual again. It could also be looked at by the spirit as disrespectful.