Hello,
Unsure if there is any such clause which can restrict in for minimum number of days, best to contact Delhi RTO for same
For other info
> Road Tax to be paid (for less than 6 month Old car): 12% if Price less than 10 Lakh or else 14% of Invoice Value
> Entry Tax - Slabs can be known in Telangana
> New RC, Number Plate & Registration - Rs 1000 approx
> Process Note -
Inter State RC Transfer
Note - you may claim refund of road tax paid in Delhi once the new TS registration mark is obtained.
Check out this note on -
Road Tax Refund
Hope should help !!