yes they can leave the country
it depends on the number of days your out of the UK.
are you on a spouse visa?
is your visa valid for 27 months?
GENERALLY you NEED to have been in the uk 23 months b4 you can apply for ILR as a spouse, but you can leave the country, but the uk is suppose to be your home
tell me the date you entered the uk, and the start and ending date of your visa and i'll tell you when you can apply
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