Hi Anshikaa,
Note sure If I am understand your question, but here is the below link for more details.
https://forums.adobe.com/thread/2329315
Generally, Single Byte is consider as Single Character.
For Eg;
- Prop = 100 Bytes
- eVar = 255 Bytes
For List Variables Character/Byte Limitation.
https://marketing.adobe.com/resources/help/en_US/sc/implement/listN.html
Thanks,
Vijay