No; "mins" is often used. I normally use singular and plural forms of those abbreviations: "1 min", "5 mins", "1 hr", "5 hrs". It's probably considered not wrong to use singular forms of abbreviations with numbers that imply a plural form.
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KrisBlueNZIt's p
KrisBlueNZI'm certainly no expert on this subjectPeople who claim they are experts on a certain subject are often ... wrong :-)
KrisBlueNZand I was in two minds about whether to reply at all.I am glad you did reply ... being friendly and ready to help means much more than just "being an expert"