Bug 1036928 - Allow to set longer time estimages as 60 minutes

Submitting this one as discussed with Bob so he can guide me further if any more changes need to be done.

I haven't formatted the text box with css. It's now showing class:fill-width property.

Waiting to know your review on this.

Had another pull request- but it was not getting "able to merge sign"- hence created a new branch and from it sending the pull request again.