Maximum phone verifications when setting up gmail account

I have relatives that I had opened for them an email, the problem is that since all stabily in the same locality, I used a single phone number to register the gmail accounts. However I soon got the "message from Gmail warning me of multiple verification on one number. What is the maximum limit in gmail phone verifications? Which email provider enables many upto 10 verifications? since the area is remote, i activated the sms to email option and wanted all of the relatives to have one source for the emails