Chemotherapy after bowel cancer operation

Hi

I had my operation on the 20th April to remove a tumour and lymph nodes of which 2 were affected but everything was contained within the bowel wall, I have an appointment next week to discuss chemotherapy which will probably start mid June, I have a holiday booked in July so I was just wondering would it be feasible to delay the start of treatment by 4 weeks ? or is this not recommended ? Thanks for your advice in advance.