Translation of unentbehrlich

This is almost six hours, a long time for someone who has children and a day job. I recommend that we write eachother shorter emails and in both languages. Spanish and English next to eachother.
Before you make a reservation we need to check whether it has car parking, please wait. I will be in Switzerland next week. I am trying to get 4 or 5 days off. I will be back on the end of the year.
There is a big chance that one of our 25 000 monthly visitors will use some of your suggestions. We wanted to make a book (more fun for our users), rather than a conventional informative page!