Hello @Janeanne As a sitter myself we try and reply promptly to any message and if we are busy we aim to reply within 24 hours.
The site guidelines ask members to reply within 72 hours. I think as long as you have sent the invite message, the sitter will follow up with you if available for your sit. Therefore in the examples you gave above, if they do not get back to you then I would not follow up with them.
Keep reaching out to sitters, your dates are 6 weeks away and there is still time for sitters to apply (I know that you would feel more comfortable getting everything sorted sooner that is completely understandable).
I can also see that you were talking to another member on a different thread so good luck with that 
1 Like