Pansy issue?

How long should the pansy seeds take before they start giving out flowers and thickening up? I'm fairly new to the gardening lark but these almost seem stretched to me,
These have been in a conservatory on the windowsill since propogation, any advice would be great thankyou.
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Pot them up individually, they’ll thicken up on their own and flower for you in the spring.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.