I use parafilm M (there are different kinds of parafilm, not all the same) With the wax paper backing.
The advantage of the stuff is that it breaks down in sunlight or by stretching to much due to scion growth. So i just leave the stuff and never worry about it. I usualy do no more than 2 layers of stretched parafilm over buds. They all brake trough fine. I also somtimes paint over the parafilm with interior white latex paint. All the grafts grew trough this.
On the woody parts of the grafts i sometimes wrap thinner strips of prarafilm 5+ times around (as sort of a rope) if i am worried the wind or a bird might try and move my graft. Even this naturally falls off.
However if you use rope or plastic strips, you will have to cut it loose at some point. I would not worry about it until you got roughly a foot of new growth.
The reason for cutting it loose is that when your scion grows, it also gets thicker. And if the rope/plastic is wrapped to tightly it can’t get thinker and thus the scion is girdled.
However, cutting it off to early, will make your graft more suseptible to mechanicle stress. The mechanicle strength of the graft increases when it heals, but mostly when it “thickens” (new “layer” of growth over the graft)
You can usualy see quite clearly when a graft is getting girdled. (the twig is thicker before and after the spot where you wrapped it and it is girdled) And a little bit of girdeling is not that bad. It takes quite a bit and for longer period of time for it to actually die due to girdling from grafting.
If your getting worried, you can always cut it loose a month or 2-3 after leafing out. (cut don’t try to untie, untying usualy leads to breaking it off, and the cut mark on the graft heals back really fast. might even increase the strength of the graft. (you cut lengthwise over the graft) And if your worried it might break due to birds or wind. you can rewrap the graft.