52 periods and 40 tasks are displayed at a time. You can extend easily as needed. Calculation sheet (hidden) accounts for up to 100 tasks. This can be extended if needed.
This is a regular Excel file with formulas and conditional formatting. No macros or programming. Hence, you can extend this as needed. The Gantt sheet is protected to avoid making unintentional edits. You can unprotect using indzara as password and make changes.