Hello
Just did some more search on this employment subject.
On below link, page 36, please see these points:
49. a full time job is one involving at least 30 hours’ of work a week. Two or more part time jobs that add up to 30 hours a week will count as one full time job but one full time job of more than 30 hours work a week will not count as more than one full time job.
50. Where the applicant’s last grant of entry clearance or leave was as a Tier 1 (entrepreneur) Migrant, the jobs must have existed for a total of at least 12 months during the period in which the migrant had leave in that category.
This need not consist of 12 consecutive months and the jobs need not exist at the date of application, provided they existed for at least 12 months during the period in which the migrant had leave as a Tier 1 (entrepreneur) Migrant.
http://webarchive.nationalarchives.gov. ... iew=Binary
I have highlighted above in bold which confirms that duration of jobs can be any number of months.